I think Daytona, though it's not my favorite beach, it seems to meet the criteria for your friends visit. Daytona still has many small family owned hotels, careful searching can find clean beachfront properties in the $50 range. I think there is a publication on small properties (try the visitor center). Daytona is do-able without a car and there are lots of activities. I think Bike Week is early March you'll want to check this out first. Enjoy your visit.