Kayaks?
Bikes?
Rec Center membership?
Amusement park/water park passes?
Museum/other memberships (aquarium, zoo, discovery museums for young kids)
Staycations or less expensive vacations like national parks

I'd love to get a boat someday but getting a truck to pull it, trailer, boat, boards and tubes, and maintenance costs without going into debt is difficult to obtain in the short term for a young family.

What have you found to bring your family together/build traditions and memories that made a difference that the average family can pull off without debt?