Leventhan has a good one here.Shadow made one geared more toward what you're looking for. (I'm sure you've seen both of these)
If you want my ten cents, though, I'd cram everything in that map together a bunch and fill the empty space with tall grass, rocks, and other shrubbery. It's not so much about "I'm not doing this! It's not going to look good!" with making good maps. You really have to trust your instincts and throw out what looks bad, and keep what looks good. People can tell you to put stuff everywhere, but that doesn't mean anything to a lot of fledgelings around here.
My main suggestion: Take a good, hard look at the awesome VX maps laying around (and there are a lot). Find something (perhaps a river, or a particular cluster of houses) that catches your eye, and try replicating it on your own. Don't copy it tile for tile, because that's cheating; rather make your own version of it. And when you think that looks good, throw it away and do it again- only this time, do it without using that map as a model. Then do that again five more times, and when you feel you've mastered making that beautiful river, move on to the next thing that catches your eye.
The bottom line is that mapping takes practice. You can't expect to churn out a beautiful map unless you've done it before, and the more maps you make, the better your chances are that you've made that awesome map.