i surfed with DD a few times up until i was about 12 weeks. But only in small steady conditions. (suit me best anyway! ) My OB was fine with it, like 1pj said, most exercise you are used to is fine.
I would have loved to surf this time around, however i just didn't find the time before my belly started popping out and getting uncomfortable...... who am i kidding? between looking after DD and MS i was never going to find the time! lol
I would be comfortable bodyboarding when preg if it was something i normally did and i was comfortable in the conditions i was going out in.
Being in the salt water when preg is lovely. I am jelous, catch a wave for me!