Roughly 25 miles bridge to bridge, LONG no wake zone, in the refuge (about a mile), fuel in topock, havasu marina, others. Have been all over Havasu in a 17', just keep an eye on the wind, should be fine. There is a few sites to see along the way. Laughlin to Havasu and back is a full day (for me) 180+ miles in one day with open headers, my ears needed a break.
Daniel
Mash on it