LMspencer / Shutterstock By Frommer's Staff The great thing about Costa Rica's beaches—other than the flour-soft sand and the top-notch surfing and snorkeling—is that many of the best coastal areas abut marvelous and mysterious rainforests, mangroves, dry forests, rivers, and other natural wonders. That means you can pair a beach vacation with canopy tours, wildlife watching, zip-lining, whitewater rafting, and canyoneering. These inland adventures in pristine green spaces are the yin to Costa Rica's sandy yang.