If you like vulcanos, go to Fortuna and see the Arenal spitting tons of rocks and lava. I thought this to be one of the best things I experienced in 4 weeks of Costa Rica.
If you don`t like vulcanos, go to the Quepos/Dominical area and try to find D.granuliferus. If you`re not successful, there is a place called "frogpond" in Santa Elena/Monteverde were you can see some red granus and one green granuliferus :lol:
For all the others: Costa Rica rocks, go there, see some frogs and enjoy the vacation :wink: