If you only have 36 hours and you are at Nickerson, I would go to Coast Guard Beach. I love Race Point but it is a long drive. P-Town is fine for kids-there are a lot of people who lead "alternative lifestyles" but it's now going back to its roots as an artist area. Lots of tourist shopping and fun stores. Waterfront has been redesigned some as well but you will eat an entire day between visiting the town and driving out there. I'd bike along the canal starting in Sandwich. Go to Seafood Sam's for their stuffed quahogs or fried seafood. The trout hatchery in Sandwich is good for an hour or two. Heritage Museum and Gardens, also in Sandwich, has multiple things to do for both kids and adults.