If you want the beach but room to actually move around this is it. Its 55 minutes to an Orlando theme park and that gives you some mid week activities to enjoy.
We found a local charter boat run by a family. We got to see river dolphins and mnatees up close.
The Village of Cocoa is on the mainland. It offers some fun shopping experiences. Even my 11 year old son enjoyed it.
Ron-Jon's is worth browsing. There are some go-kart options. Andretti's was fun and we got our fil in 2 hours as it was not crowded. If you are looking for a great family location without all the hustle and bustle of some busier locations, check out Cocoa Beach. Just be kind and not tell too many people. We plan to return.