I've been using the Greenfish CPR camera mount for my GOPRO3 plugged into a Scotty mount on my Adventure. Mounted on the rail just behind the seat it gave a nice view & was very quickly adjustable to reposition the camera angle. However I just found it's broken recently so I shopped around & found that Ram Mounts came out with a flexible camera arm, Ram Flex Arm, last year & so I ordered one last night as it looks stronger than the Greenfish CPR. The Ram part number is RAP-B-200-1-114P-18U in case you're interested in checking it out. Since it's only 18" long I also ordered an Adapt a Post 15" extension pole to bring the total length to 33" which is what the Greenfish length is. Although I can't recommend the Greenfish because it broke, & didn't last as long as I had hoped, here's the link for it in case you want to check it out anyway.
http://greenfishmovement.com/shop/cpr-mount/