Preschool Geography Ideas?

I really would like to do more with geography with my PreK students. I like the book "Me On The Map" by Joan Sweeney and am incorporating it this next week but I'd like to do more, especially this fall. Any tried and true ideas? For example, one thing I'm going to do next year is have a blank map of the U.S. and do a postcard swap with others from the states and we'll color the state in when we get a post card from that state. But there are so many aspects to geography. Would love to hear your ideas! Thanks!