Time with son

I want to find an activity that will allow me to spend time together with my son in an exciting way. What do you advise? The child is 11 years old. I go fishing with him, but now the weather does not allow me to spend time like this often.

My son and I go fishing on weekends in any weather. He is already an experienced tourist with me. But I try to find entertainment for him at home. I allow my phone to watch only an hour a day. I recently bought a home planetarium. I purchased discs double pack 2 for sega toys homestar planetarium additionally https://astronomix.info/planetarium-discs.html The child learned a lot of information about Day and Night Earth and Moon