I certainly have not read ALL the literature regarding MS...
but I've not yet seen anything that suggests that amusement park rides would be forbidden for people with MS.
I do know this, though: I have serious issues with loss of balance and loss of sense of where my left side is, due to lesions in my brain and/or spinal cord. This means in the "real world" that things like amusement park rides are impossible for me to enjoy anymore -- I get sea sick even thinking about riding on one of them! So you might find yourself uncomfortable after going on them, but they in themselves shouldn't affect your lesions, wherever they're located...