“Come to the Lake”:http://www.cometothelake.com/businesses_listing_boat_watercraft.html provides a good list:
Chelan Parasailing & Watercraft Rentals
158 East Wapato Way
P.O. Box 523
Manson, WA 98831
(509) 687-7245
Sharkey’s Watercraft & Snowmobile Rentals
(509) 687-2312 or (509) 470-2468
Mid-May Thru September – rentals of personal watercraft, open bow family ski boats, and 24′ pontoon boat (10 person max).
Ship N’ Shore Watercraft Rentals / Marina
1230 W Woodin
PO Box 1090
Chelan, WA 98816
(509) 682-5125
Directly below Slidewaters. Many sizes of boats and personal watercrafts available.