Dear A.:
How sad to leave San Diego! I still haven't gotten over it myself! Well, you're going to have to find a "different" kind of fun. Yes, there are those things which were mentioned but how often can you do the same four or five things? We have found fun in less "spectator-ish" arenas and more "participatory" ones.
For example, during the fall and winter, enjoy the terrific bike trails around town. Frisbee at the park, set up easels and sketch or watercolor. Drive south into the middle of nowhere with your telescope, blankets and a picnic and enjoy the stars, the quiet and a cuddly dinner in the car. Go bug hunting, set up targets and shoot arrows, pursue a sport, etc.
The other form of entertainment which our kids love is hanging out with friends...no, not running around outside unsupervised, we hang out as families together and cook at different homes, play board games 'til all hours, do group chats online with friends far away, participate in events at church, take classes together, etc. Have a potluck at the park and let the kids skate until dusk...
It helps that we're homeschoolers because then we have the time to form these relationships but you can do this on the weekends too...why not? We offer sewing classes in our home or piano or whatever and relationships start. Next month, a group of us are going to Legoland. It's much more fun to do real things with a terrific group of friends you can later share the memories with.
Best wishes to you!
M.