We made our summer calendar a week ago, here are some of the things we have on there:
Kids summer movies (check your local movie theaters, ours do $1 kids movies at 10 am on Tuesdays)
Heritage Park (this is the place)
American West Heritage Center
SS shortline train
Library story time
Several events our library is doing for summer reading
Roberts kids crafts
A few camping trips
My oldest is doing a summer program with his preschool for 5 weeks
and plenty of space for spur of the moment stuff.
Do you have any ideas to add?