Photos from the US for use in a college design project (magazine)

Hi! I'm not exactly sure where the best place to post this is, but I have a graphic design assignment that I will be working on for the next few weeks. I am designing a nature magazine relating to hiking, camping and backpacking. I'm looking to see if anyone has any pictures they've taken in parks or forests around the US (national and state) that they would like to let me use in it (free). I'm unsure yet if we have to write articles for it or if we will just be using filler, but if you'd like to share stories, tips, etc. that would be awesome as well. This will also probably be used in my portfolio if it turns out good. All I would ask is that if you do send any that you clarify in a message that I have permission to use the material, as well as the information to properly credit you.