OK, here are some cool and unique alternatives to the beach in the next few days:
Materfest: A tomato festival in Canton, NC which is outside of Asheville in the county with NC's highest elevation. Sounds hokey, but this is very fun, and food is amazing, especially, well...the tomatoes. Also CHEAP tip: visit the packing houses around Canton and you can get 25lb boxes of amazing tomatoes for about $6.00, retail value of around $75-$100.
If you are right here on the beach in my fair city of Wilmington, you SHOULD be going to this downtown anyways: Coast Guard City Celebration: The USCG traditional sail vessel the Barque Eagle is in Wilmington as part of introductory sail training for USCG Academy cadets. IT is also on display to visit(ticket permitting) and is literally a one-of-a-kind ship in todays modern day and age.
And of course, thifty tourist friends, it is tax-free weekend!