I just got back from Disneyland and was able to ride whatever rides I wanted to. However, I don't like roller coasters, so I didn't do any of them. Pirates of the Caribbean was as wild as I got. I did have to rent a scooter because I can't walk very long. Even using the scooter, I was exhausted at the end of the day. I did have some pain also from the rides, but it was worth it to me just to be able to go. I love Disneyland.
I agree with Lynnwood, it is up to the individual and what they feel they can do.
Wherever, you decide to go, have fun!!! That is more important.