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Poncho to cover your backpack.

8x is the best magnification before you need electric image stabilization.

Quick dry shirts are a must. You will get rained on. Don't panic or run for cover. The rain stops in an hour or so.

Oh yeah. All the guides have them. Join geekdom.

This is all you need. Fill this up after your flights. Water and some tortillas for breakfast, will do it everyday.

There's no waterproof hiking boot that works in a rain forest. Your feet will get dirty, but this is definitely the way to go. The guides wear these and then rubber boots can be rented for $1 at the parks. Pack extra socks for the rubber boots in your day pack.

Trail shoes are basically sandals with a cover. They are designed to try quickly and mimic a sandal. If you really don't like the sandal recommendations, go with the trail shoes with the quick dry upper.

Backups for your head lamp.

This is an easy backup.

Emergency gear.

Sun protecting shirts.

I used a separate block for my face.

Don't take this on the airplane - check it with your duffel.

If you don't want to wear nylon hiking pants, wear overpants and shorts.

It never gets cold in CR (Ok except for the two 10,000 foot volcanoes in the Quetzal National Park. Are you really going there?

This would have really helped. CR is working on its own, separate dialect of Spanish... beware.

MP3 player - this one has Skype/Wi-Fi