A bar would be dope but you'll have to go to Lake WA for that. Lake Sammamish is all residential water front proerty, a business would have to buy a house to tear down and build a commercial restuarant. Dont get me wrong I would love to see it, buts its not likely.
I don't know of any public places to dock and hang out. Mostly just the rich locals that live on the lake who have that privelage