Heh, I can relate to this. Not much but boring bushy forest and open sky here. Then winter for 9 months. Heh.
National Geographic is a great source, as Chris said. I have a subscription which is effin expensive, but worth it. Dont copy the photos though, use them. Dont copy the shapes, instead construct the forms with perspective. You'll get a lot more out of using photographs if you build whats in them rather than copy them.
Also dont be afraid to use your imagination. This is something I'm going to be trying soon, and thats to take a series of photographs and try to build some sort of environment out of ideas from them. Maybe have a photo of a cool looking bridge, and a photo of some ruins and a nice landscape, and put your own spin on it.
You could go a step further even and make your outside environment interesting. Go outside and start drawing your back yard for instance, only instead of drawing everything you see, put something interesting in it like an alien space craft with aliens invading your house or something, eheh.
If you just want to practice drawing outdoors, draw your house, apartment, or cardboard box, whatever you call home. Draw it from different angles at different times of the day.
These are just a few ideas I have. I cant say I've really tried any of them as I'm still working on getting basic form down and understood, so if you try any of these ideas let me know how it went!
jtriska @ mcleodusa.net