I'd appreciate some expert advice. I am traveling to Costa Rica for two weeks this summer, as part of a study abroad class with other students and at least one faculty member. We'll be spending time in the rain forest, one coast or the other (no idea which yet), making a visit to the Arenal volcano, and also spending some time in San Jose and a resort area. I don't need to bring a tripod because the professor will have two. I can only take one large bag, and also a shoulder bag/briefcase. In my case the bag is a North Face Big Shot backpack, a rather large day pack which I've traveled out of for as much as a week with little difficulty; my satchel is a Domke 802 and I can get some gear into that as well. Here is the 35mm gear I have to choose from (I've already ruled out taking the Mamiya RB67): Nikon F100 with MB-15 (I may leave the vertical grip behind) Sigma 12-24/4.5-5.6 Nikkor 24/2.8 Nikkor 50/1.4 Nikon Series E 70-210/4.0 Sigma 150-500/5.0-6.3 a small monopod As much film and spare batteries as I can pack... As a result of a project I'll be involved with, I am also bringing a Nikon D300 and 18-70/3.5-4.5 (no choice on this, it's a part of the course). Anybody have experience with travel to Costa Rica, suggestion on what I will definitely want to bring, what I probably won't use, et cetera? I've never traveled outside the US before, and certainly have no experience in a tropical climate, so clothing suggestions are also helpful. Thanks!