It's unlikely that any two people traveling to Costa Rica would use exactly the same packing list. While some would be perfectly comfortable with little more than a swimsuit, some sandals, and a couple of T-shirts, others might have a hefty suitcases of clothing, shoes and accessories and some nothing at all except cameras and dive gear.
Obviously, what you take depends on how you are planning to travel, how long you stay, and your personal preferences. Our packing tips take into account most of the situations you are likely to encounter: outdoor activities, a little nightlife, and a lot of tropical relaxation.
Since you're headed to the beach, it's unlikely that you'll overlook your swimsuit, but some other items might be a little less obvious. Although the weather is usually between 70 and 80 degrees areas in the mountains where elevations approach or exceed 10,000 feet gets cool enough to want a sweater and jacket most of the time. You may also be surprised to find that neither your rental car nor hotel room have a warm setting on their thermostat. Air-conditioning is common but heaters are almost unknown.
Shoes are a difficult choice. Serious hikers would want several pairs to match the wide variety of terrain and conditions in Costa Rica. For heavy slogging it's possible to borrow or rent the heavy rubber boots that the locals favor. However, don't expect to find anything larger than men's size 11 (size 45 European). And a pair of sandals is a must have for the beach.
Maps and Guide Books are recommended and are essential if planning to explore Costa Rica without a guide. A Spanish/English phrase book, preferably one specific to Costa Rican Spanish would be beneficial. Serious naturalists might want to read up on the natural history of Costa Rica. And don't forget something to read while swinging in a hammock on the beach.
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