What to pack for the Osa Peninsula (and what to leave at home)

The Osa is hot, wet, muddy and bright, and it eats equipment. It is also a place where you will fly on a small aircraft with a strict luggage limit, walk beaches in full sun, stand under a canopy in a downpour and then want to be comfortable on a terrace for three hours after dark. Most packing lists for Costa Rica are written for Manuel Antonio. This one is written from the end of a gravel road on the peninsula.

The ten things that actually matter

Two pairs of shoes you can ruin. Trail runners or light hiking shoes for the forest, plus sandals for everything else. Heavy boots are a mistake in this heat; wet feet are inevitable, so choose what dries.
A proper rain jacket. Light, packable, breathable if you can afford it. Ponchos flap and tear on trails.
A dry bag. 10–20 litres. You will land on a beach from a boat at Sirena and you will get spray on the gulf. This is the single most-forgotten item.
Quick-dry long trousers and long-sleeved shirts. Sun protection, mosquito protection, and they dry between the morning walk and the afternoon one. Cotton does not dry here.
Insect repellent with DEET or picaridin. Dawn and dusk are the moments that matter.
Reef-safe sunscreen and a hat. The beach walk into La Leona is merciless, and the gulf reflects everything back at you.
A head torch. Night walks, unlit paths, and the occasional power cut. A phone torch will not do.
A refillable water bottle — two litres per person for a park day. Tap water is safe here; there is no reason to buy plastic.
Binoculars. If you own a pair, bring them. They change what you notice from your own terrace before breakfast.
Cash in colones. Cards work in most places in Puerto Jiménez, but small sodas, colectivo trucks and village guides run on cash.

Clothes, properly

The temperature barely moves all year: around 24°C at night, 30–32°C by afternoon, humid throughout. You are not packing for cold; you are packing for wet, sun and insects.

Three or four quick-dry shirts, at least one long-sleeved.
Two pairs of light trousers; shorts for the pool and town.
Swimwear × 2 — one is always drying.
A light fleece or long sleeve for boat mornings and the small aircraft.
Socks: more pairs than you think, all synthetic or wool.
Something you feel good in for dinner. This is not a formal place, but golden hour deserves better than the shirt you sweated through at Sirena.

Colours: neutral greens, browns and greys for wildlife walks. Bright white and neon read as movement in the forest.

Electronics and power

Plugs are the US type (two flat pins), 120 V. European visitors need an adapter; check your chargers handle 120 V.
A power bank. Long days out, and some lodges here — ours included — run on solar.
Zip bags or a dry pouch for the phone. Humidity gets into everything.
Camera: a zoom lens earns its weight on the Golfo Dulce and at Sirena. A phone is fine for landscapes and useless for whales.
Download offline maps and your booking details. Coverage is patchy in the hills.

Health and small print

Any prescription medicine, in its box, in your hand luggage.
A small first-aid kit: plasters, antiseptic, blister care, painkillers, rehydration salts.
Anti-itch cream. Sandflies on the beaches are the real nuisance, not mosquitoes.
Motion-sickness tablets if boats bother you.
Travel insurance that covers small aircraft and remote areas.
Passport. It is checked at the Corcovado ranger stations, not just at the airport.

The luggage-weight trap

The domestic flight from San José to Puerto Jiménez has a low baggage allowance — typically around 30–40 lb (14–18 kg) including hand luggage, with fees above it. Soft bags travel better than hard cases on these aircraft and on gravel roads. If you are doing a longer Costa Rica trip, leave a bag at your San José hotel; most will store it for free.

What to leave at home

Heavy hiking boots. Hot, slow to dry, and no better on these trails.
Jeans. They never dry. Ever.
A hairdryer. The humidity has other plans, and on solar power it is a genuinely bad idea.
Camouflage clothing. It is restricted in Costa Rica and you do not need it.
Single-use plastic water bottles. The tap water is good; bring a bottle.
Drone, unless you have checked. National parks and reserves are off limits, and wildlife does not enjoy them.
Most of your clothes. Every returning guest says the same thing: they packed twice what they wore.

Season adjustments

December to April (dry): more sun protection, less rain gear, and dust on the roads. Trails are firm.
May to November (green): the rain jacket becomes essential, add a second pair of shoes, and expect mud on everything. September to November is the wettest — pack accordingly and see our month-by-month guide.

If you are doing specific days

Corcovado: closed shoes, 2 litres of water, rain jacket, sunscreen, repellent, dry bag, passport, swimwear, a change of clothes left behind for afterwards.
Golfo Dulce boat: hat, sunscreen, light layer, towel, swimwear, dry bag, motion-sickness tablets if needed.
Night walk: long trousers, closed shoes, head torch, repellent.
Bioluminescence: swimwear, towel, a dry layer for the boat back, and nothing you mind getting wet.

Frequently asked questions

What should I wear in the Costa Rican rainforest?

Light, quick-drying, long-sleeved clothing in neutral colours, closed shoes that dry fast, and a rain jacket regardless of the forecast.

Do I need hiking boots for Corcovado?

No. Trail runners or light hiking shoes are better in this heat and humidity. Whatever you wear will get wet and muddy.

Is tap water safe on the Osa Peninsula?

Yes. Our water comes from our own well and is safe to drink; town water is treated. Bring a refillable bottle.

What plug type does Costa Rica use?

The US type, two flat pins, 120 V. European and UK visitors need an adapter.

Do I need to worry about mosquitoes?

Bring repellent and cover up at dawn and dusk. Sandflies on the beaches are more of a nuisance than mosquitoes at the lodges up in the forest.

Can I bring a drone?

Not into national parks or reserves, and not over wildlife. Check the rules for anywhere else before you fly.

What you will not need to bring

Each of our four lodges has a kitchenette with a fridge, stove, coffee machine and a grill on the terrace, plus hot water, A/C, towels and bedding — so bring groceries from town rather than kit. We are 5.8 km from Puerto Jiménez and we will collect you if the gravel road is not what you fancy after a travel day.

Anything you forget, ask us. There is more in the store cupboard than you would expect, including spare torches.