We happen to live pretty close to Seaside, Florida. We love everything about Seaside. It's close to the beach. You can rent bikes. Everything is within walking distance - restaurants, entertainment, shopping. Although it's geared towards tourists, it's a quieter vibe. No mini golf or t-shirt shops or arcades. We love that about it and often spend a lazy Saturday morning in the area.
What I'm looking for is something similar but a little farther from home - somewhere on the east coast of the US (Florida, Georgia, the Carolinas). A small beach town where we can park our car (for the most part), rent bikes, shop, eat, and generally relax.