Hanging out on the Boardwalk is a lot of fun. We stayed there this past November and had a blast. During the day we rented the 2 person bike and rode around the whole boardwalk area, then went to the arcade. At night they had magicians, music, kids getting their hair braided and face painted. It was so much fun to be around, definitely a lot of energy.
We also enjoy the Winter/Summerland mini golf by Blizzard Beach.
We went to the World of Sports once in the summer and had a good time. But I think we got lucky, because normally there isn't a whole lot going on there but we picked a day when one of our local little league teams was playing so we actually saw people we knew and watched a fun game.