I think it's sad that no one answered this question; do people really not enjoy spending time with their parents? :(
For me, I always loved hiking or camping or doing something outdoorsy with my parents. I still do that occasionally, even though my parents are getting on in years :P I also liked going for a drive with them or going to museums and places like that. I'm glad that my parents and I are able to do so many things together. I know other people who hate spending time with their parents.
We go to the movies, watch movies at home, play board games, play video games, go to the zoo, aquarium, an arcade type place with games, a few rides, Laser Tag, and go karts, and a place with different trampoline sections to jump/play on. I enjoy time with my children regardless of what we do.