SWEET! 
Jim, Wow, does that ever bring back memories! But, I can not remember how ahead of their time some people were... I can't believe it but there are a number of DUCK TACKS out there! That is amazing... But on those big floaty boards it's a little easier... But add the king size bed sheet as your sail and I am blown away!
Also, many of them are wearing "parachutes"... Safety first huh! 

 Did they carry food and water in those backpacks or were those special flotation devices? Not so sure I'd want the flotation to be on my back..> I only want to stare at the fish for a moment! he he... I don't remember some of those details.
BTW... I listened to Crosby Stills and Na(i)sh's Wasted on the Way, Teach Your Children, and Blackbird while I watched it... Went pretty well! Thanks man... Are you in some of that vid? Have you recognized anybody in those? Lynn Stevens, Grant, Duane...?
Actually almost any song from the 70's goes with this! Bread was cracking me up... Baby I'm a want you... wow... even the new stuff makes it funnier... Bon Jovi, Blaze of Glory... Cake, Satan is My Motor took a minute to blend in but did!!! (beauty of MP3 technology)... Aerosmith Sweet emotions, Eric Clapton... If I could Change the World... Nothing seems to not work with this footage somehow!?! Even Dee Lite, Groove is in the Heart... Must be a classic video!
ALSO, I love it... Notice how they're out there sailing on East, West, North, or South winds... That's before we learned to whine about the wind!