As I said earlier, for older runners (high school & up) who don't need to worry about competing in school sports the half marathon is a wonderful challenge. Just follow what Lou said in his post and you should be fine.
Other than the Indy Mini, my favorite Half is the Ludington Lakestride.
This small Ludington, Michigan race is held in mid June. It starts near the channel next to the Lake Michigan shoreline and goes north into the Ludington State Park for about 2.5 miles on a nice hard sand trail. The course gradually climbs to exit the trails over a large sand dune and then rejoins the road for the last half along the Lake back to the start. It is a hard course to run quick times but you can't beat the scenery.