All great ideas, so far, though I wouldn't worry about taking things to entertain you during the downtime 'cuz the comraderie and converations were some of the best parts of the trips.
For the camera, if it's digital, be prepared with lots of memory cards or a way to download during the week. Your laptop is certainly one option, but if you have a video iPod, Apple sells a USD$30 adaptor that will let you direct-connect your digital camera and download/store/view your photos on the iPod for later transfer to your PC(as long as you're not shooting RAW).
BTW, we did the Nekton in May with temps on the computers from 73 - 79 degrees and my son was fine in his shortie the whole week. Me, I used my 3mil full.
P.S.- thanks for loving TURTLES - I make 'em for a living here in Toronto!