I’m working in Yellowstone National Park this summer and plan on taking a lot of nature shots, but I’m trying to find the best camera for under $400. Any suggestions?

The primary use would be for nature photographs (beach and redwoods) and the occasional pictures of friends (red eye bad). I want a point-and-shoot for portability and because of money restrictions. I have about $250, but could stretch it too 400 if the camera is significantly worth it. The size/shape of the camera isn’t as important as the quality of the pictures, but I do like the square no bulges of some of these point-and-clicks. I had a canon S500 which I was happy with, but it was stolen. Any suggestions or tips? Should I get a used S500 again from Ebay? Or is there something way better out there for me? I was also looking at new Kodaks? Help?