Hi zurb,
Are you shooting from the back of a boat or from the shore? Either way you're still going to need a pretty fast shutter speed to freeze the action.
I would say use as fast a shutter speed as you can get with around 1,500 - 2,000 sec & upwards being something to aim for, this will freeze the boarders & also the spray droplets from the water. You can get away with a bit less than this but you will risk more shots blurred by the motion. Of course you may on some shots want to show the speed of the boarders with a bit of creative slow s/s panning but obviously with this method you will get a lot of shots that need binning, well worth the effort if you get a few good-uns though.
One thing I'm curious about is why you're using this lens (the 80-200) on a tripod though. Tripods are generally very restrictive for sports work, if you really need something to steady the camera it's better to use a mono pod although personally I hand hold all lenses up to a 300mm with a 1.4 converter, it just gives you so much more manouverability.
This is a TP link to some wakeboarding I shot at Milton Keynes last year, these were shot using a 400mm f2.8 some with a 1.4 converter giving a
560mm f4 all wide open & hand held (when I say hand held I was sat on the grass with my elbows resting on my knees for stability) they were shot at around 2,000 & 2,500 of a sec.
http://www.talkphotography.co.uk/forums/showthread.php?t=317462
Luck,
Stew.