Let's not forget that sometimes only one feature is great. I'd trade every whitewater park in Denver for the single feature at Buena Vista.
Also, that one feature is probably more than enough to prove that the development of a wwp would be worthwhile. Correct me if I'm wrong, but I think that having one feature helped BV secure the GOCO grant for there park, all because of proven use from their single feature.
I say build one feature, and go from there.