Costa Rica is an awesome place to travel, and it's true you can find some really cheap tickets! I got down there for around $600 RT. But Costa Rica is filling up with travelers, and depending on your style of travel, try to shoot for some small towns a little off the map. Dominical (central pacific side) is supposed to be wonderful, but quite the bumpy road to get there. The Nicoya penninsula coast towns are wonderful with some good surf spots, but can also be very touristy. There are tons of waterfalls more inland that make good hikes, and the south carribean side is awesome. We rented bikes in Puerto Viejo, and rode them down to Manzanillo, the last sleepy town before the Panama border. From there we hiked down the coastline for miles, checking out tidepools and all sorts of cool things. That meant we had to ride the 12 or so miles back to PV in the dark, which was quite scary, but that was the best little excursion of the whole trip.
Cheers! To friends, to lovers, to warm nights and cold drinks.