Downtime at a regional? I always thought you east coast people were a little odd.
If you do have downtime (through say, a field error like at the Rookie Regional) Pick up a camera and document the experience. No matter what anyone tells you you can NEVER have too many pictures. 4 years from now your team may want documentation for a potential sponsor or something and it is better to have pictures. Besides, memory is cheap now. Aside from that, make some friends. FIRST is a pretty social place.