Get your passport if you don't have it already. Costa Rica also requires proof of a purchased ticket to leave the country, which you will have as part of your all-inclusive vacation package.
Decide where you want to spend your all-inclusive vacation in Costa Rica (see Resources). The options are plentiful.
Pick your priorities. An all-inclusive vacation will generally include airfare, hotel, food, beverages and possibly tours. If you know before you book what you're looking for in a hotel and what activities you want to participate in, you can look for these in the package.
Compare prices.
Make your reservations early. Peak season is from December through April. If you can travel at another time of the year, you may be able to get a last-minute booking. You can book your all-inclusive vacation in Costa Rica through a travel agent or online (see Resources).