J.S.
Wow! We went to Costa Rica for our honeymoon and we loved it! We went late June/early July for three weeks in 2011. I would absolutely recommend it. The place I went seems very different than the place Riley J describes.
We stayed in four different places during our time there.
Tortuguero on the Caribbean side, la fortuna with the volcano nearby, monteverde in the cloud forest, and samara on the pacific ocean.
All were beautiful. Great people everywhere. So friendly and helpful.
The roads are awful. We chose to not rent a car and use shuttles or private transportation. Worth the cost!
Feel free to send M. a personal message if you have more questions!
Ps - my husband got an ear infection in samara - we found an English speaking doctor who was wonderful!