Sports/Activities for 8 yr old SID BOY

My DS is not the most coordinated 8 yr old boy there is. He didn't really climb ladders (still avoids them , if possible) at the playground until after 5 yrs old. He's terrified of heights and most anything coming at him quickly (balls, people, etc). : ) Actually, he'll play catch and doesn't really flinch anymore. However, he won't play baseball and claims he'll die if he plays just about any sport. By die, I mean, he literally thinks he'll be trampled to death, hit in the head with a ball, lose an eye, etc. Poor guy.

Just before we realized he had SID (we knew something was up, but had no word for it), we put him on a local basketball team. He was in his age group when I heard a coach ask another how old he was. They thought he was younger, because of the way he ran. They then placed him in the younger group, where the children were still so physically sophisticated. It was PAINFUL to watch him.

So...that was last summer. This summer I really was hoping he'd get into swimming. I'm sure you all know where this is going. : ) Actually, he can swim on his back beautifully, but can't stand water on his face. I thought maybe he'd be interested in a swim team, etc. I even had him watch the Olympics.

Here's my thing. I don't totally believe that organized sports are necessary. However, I want him to be able to blend in and get by when playing PE at school. He's in the fourth grade. He's fairly tall and big. He's not overweight, but could be in the near future.
His tends to jump and do this tippy toe dance and moves his hands in a strange way. The teachers haven't noticed it, so maybe he hides it at school. However, he can't hide the fact that he has little athletic ability.

Can anyone recommend how we get him to blend in? We've tried Jui Jitsu (sp?), but they've been on break for the summer. If you have kids this age, what activity do you have them involved in?

Thanks : )