Cahoon Hollow Beach and the Beachcomber are a part of the fiber that is Wellfleet. That being said, if you're heading out to Wellfleet, you have to go at least once. The food is very casual and the atmosphere laid back. During high season, there are lots of nights of live music that's worth checking out, too.
But, the parking lot is too small, so plan your day trip carefully. I recommend making a day of it and arriving at the lot by 10 if possible. On most days, there are cars of people waiting to get in to this parking lot. As one of the few beaches you can go to without a beach sticker and the only one with a restaurant (and a restaurant that will validate your parking to make it free!), it fills quickly.