Here’s something that would go over well when out of town family and friends come to visit:  a 30 minutes boating excursion on Seadog Cruises.  Normally $25, your Groupon gets it for $13.

Deets:  Expires Sep 30, 2011.  May buy multiple as gifts. Limit 8 per visit. Not valid on holidays or specialty cruises. Not valid 7/2-3, or 8/19-20. Not valid for all seats. Not valid on holidays or for specialty cruises. Tax included.