http://www.whitewatercoursesandparks.com/

I was an the inaugural conference in 2005 and it got me super psyched and full of all sorts of idea and contacts.  I would suggest attending.  There will be many engineers there and lots of people who have playspots ,and play features in all stages of development that you can talk to.



Scott  
http://www.100waves.com
DR USA importer