I prefer the easier route. Snorkel, mask, and fins in popular trout holes where people fish for stockies.
Don't forget to "Bait" the dive site with a couple of old steel shopping carts firmly anchored to the bottom! I actually witnessed this at a public hotspot on the Lower Niagara several years back. The guy, an acquaintance actually, also "primed" the area with a couple of old bicycles in addition to the shopping carts!
If I caught someone doing that, I might just find myself in jail Oh, the stuff an angry mind can come up with