Camera & mini-tripod, compact binoculars, and thermometer. I got one of those Coghlan's "Digital Danglers" for Christmas (watch & min/max thermometer) which may replace my separate watch and thermometer.

I'd consider a solar shower if I had one, and I intend to try an inflatable pillow I just received.
I keep intending to take a closed-cell foam sit pad, figuring to put it under my feet at night, but I haven't yet included it.