Hi Kendall - we are primarily a road bike club with some mountain biking activities and some racing mixed in. However, you may find that our Comfort Zone (CZ) rides work with your tricycle if you are looking for a social group with which to ride.
You might check out Smoopy's Bikes http://www.smoopysbicycles.com/ over on E. Main Street in Murfreeboro. They may be aware of a cruiser/custom bike club in the area.