For some reason, they don't have the "curvy road" selection, only the "adventure" routing when the XT came along. It no longer will put you on the "curvy" roads, unless it happens to be the route it does. I have tried the adventurous routing, and it is not very exciting, with a lot of going down one road, "experience it", and it has you u-turn it to get back on your route, more of a pain in the a**. I found the adventure routing still more of a direct route, just maybe not through town, but around it. For local riding, I really liked the curvy road selection, it was interesting at times.
You have the ability on the Garmin to select avoid highways in the trip planner, and is what you are looking for. It will plan on the two lane highways, or smaller, and avoid the freeways, if possible, and is more of a direct route. You can also select "avoid tolls, and dirt roads" if you want.
I usually have Google maps up on my computer, get the lat/long of the waypoints I want, and enter it on the unit itself (make a new trip). Once you have that, if you want, you can adjust your routing using "temporary" waypoints, in between the ones you put in.