Personally I have 3 cameras.
An iphone 4s which is better than most of my compact cameras before 2007. If you have one I would recommend getting a polarizing filter, and trying to use that as your camera. It's main drawback is that it does not do optical zoom, though there are a couple of lenses available, though most of them severely degrade the image.
I have a canon S100, which is almost the same as the S90, S95, S110 except that mine has a GPS built in, so that there is one less step when I am post processing the pictures. I get about 800 pictures per memory card, and 200 pictures per battery. I have 4 batteries(they cost 6 to 11 each on amazon), and combined the 4 batteries weight about the same as 2AA. I shoot in RAW, which preserves all of the quality, then after I have made all of the corrections, and cropped, I export to jpg.
I have a canon 50D. Which is a dSLR and a beast, I will bring it on day hikes with a few spare lenses, or to scenic places. I will carry an ultrapod2 and 2 feet of velcro rolled up (it makes any tree a tripod) with me on hikes, but I leave most of the heavy stuff for trunk or studio use.
The iphone takes decent pictures. They look pretty good. But… when you try and zoom in, or you want to crop, you are not left with much. The S100 in this regard is fantastic. But it does not have enough reach for much of what I want to shoot, so I have an SLR. I have tried a variety of the super zoom cameras, and was not satisfied with the optical quality. The S100 is 24mm on the wide end, which is usually wide enough, 120mm on the telephoto end. If the 120mm is not enough telephoto, then i can usually solve that by walking closer (with the exception of wildlife).
I also carry an polarizer filter to use in front of my camera lenses when shooting outdoors, and a lenspen to make sure that the lenses don't have crud on them. When I am hiking I also take an ultrapod2, and a small roll of double sided velcro. The combination makes rocks and trees into decent camera supports.
I am not sure if my reasoning for which cameras I have helps you, but I wanted to give you a bit of the reasoning for the gear that I carry.
If you go ultralight, get an iphone(the ipad camera is inferior), it will also become your gps and your flashlight.
For reviews of small cameras check out dcresource.com. One of the features of that site is that he holds the camera in his hand, and take a picture of it. He has been doing the site for about a decade, so you can compare "in hand" as it were the differences in size between different cameras is.
-Michael