Welcome to the forum. You are way out in the country! http://g.co/maps/e8zde
You should be able to find some really nice road bicycle and motorcycle scenic routes or event routes to follow. There are some road bicycle races that go through Palestine and Tyler every year, some 60 and 100 miles with plenty of winding blacktop roads and hills up and down.
I recommend a Dax Friction Drive. You can use some commercial trimmer engines, if they have the right clutch system and 4 bolt pattern, but likely you will want a 49cc pocketbike engine. Going with Dax Friction Drive will save you a lot of trouble, and isn't too hard to move to another bike or swap engines if you so desire. http://www.facebook.com/pages/Dax-Fr...18445778250153
There is a bicycle event near there, which customarily races the coal train. Perhaps you can organize a social ride for motor assisted bicyclists, which takes the train one way and rides back. That would be really nice.