Surfing - awesome!
I think exercise, whatever kind someone can do, helps tremendously. Last October I joined a gym and went 5 times a week except when I was unable to because of medical problems, not MS related. Summers are tough to get my regular exercise since my DD is home and I just want to spend as much time with her as possible. So we've been biking, hiking, walking, shopping. I'm looking forward to September when she returns to school I can return to my regular exercise routine!