Costa Rica was a great trip, and one I wholly recommend to any photographer interested in shooting wildlife. There are ample opportunities to see animals in their natural habitat (sure beats shooting at the zoo!) and nothing beats the satisfaction of having captured a really tricky wildlife shot. Make sure you take a solid zoom lens (minimum of 100mm, though even a cheap 70-300mm will give you great results as long as the light is good, make sure to stop down your aperture a bit, or beware of colour abberetions in your shot!) and if you can, a macro lens (for the butterflies! I recommend using a cheap telephoto lens with kenko extension tubes if you’re a budget macro-shooter, otherwise drop the $$ and get the 100mm prime macro lens from canon, combine that with the kenko tubes and you’ll be able to count the spots on a compound eyeball!). Make sure you take a water-resistant camera case with a separate, dry compartment for an extra battery pack (see tips for shooting in all-weather conditions for more tips on keeping your gear functioning in the humidity!)
Below I’ve posted some of my personal faves, enjoy!