I was fortunate enough to get about 5hrs in one pu/t while flying around the Islands off Vancouver on business a few years ago. I'd say the time to be let loose in it would be many more hours than that! And then finding an FBO willing to rent to a low timer, and insure it, would be much more difficult again.
But it was a truly memorable experience. Unsticking without redlining the huge radial engine, landing into dead-end inlets with enough inertia to coast to the dock and toughest of all, having enough way on to jump onto the landing stage without bashing it, and worse, the wind blowing the now empty plane back out to sea!
Not mention avoiding cruise liners while taxying out of Vancouver harbour, tying up to the floating gas station (the only one on Earth apparently), parking directly beside the tall buildings downtown and routeing directly to uninhabited islands and innaccessible lakes in the interior.
Unbeatable! (Assuming that's the type of Beaver you were enquiring about).