A couple of years ago I went skiing with some mates. There was one run that was a bit challenging for me, I'd made it down a couple of times with only one or two offs, so it was a good test of abilities.
Somehow a joint was shared between me and my mate at the top of the run.
Holy dooley... I'd make it about five metres before coming unstuck and then have to find my skis and poles when I'd stopped sliding. Lather, rinse, repeat, for the next 20 minutes before I finally made it to the bottom of the slope. I'm never doing that again

I'd imagine windsurfing would be much the same, with the added risk of drowning if something odd happened. No way I'd ever try it.
That said, the deepest dive I made and most connected with the ocean I felt was the morning after an all night rave where a disco biscuit was consumed... I guess Wet Willy might be right, cocaine or speed might be something that would work better than a relaxant/hallucinogen such as pot, acid or MDMA.
I get such a natural high from windsurfing and trying new stuff that I can't see any reason to take anything beforehand. A cold beer afterwards, however, is a very nice thing to do