Most Helpful Girl
Why don't you unzip the top of it, roll your arms out of it, put a bikini top on, and then wear a layered skirt. He won't see the wetsuit under the skirt and will see that you are wearing a bikini (an obvious rookie mistake for surfing) and when you get there you can take your skirt off and roll up the suit. He will be totally surprised.
I only put, my wetsuits on halfway like this until I'm ready to get in the water, because they get so hot if you're on land!