Probably a PBY Catalina.
Hey, whaddya I need to be zipping around at 400+ MPH for? You try fitting a tent, a grill, the dog, a cooler, a keg, and half-a-dozen fishing rods into your P-51s, Corsairs, or 109s when you want to go on vacation though...
on that criteria i would take an H8K Emily
because its pretty
or a Blohm & Voss BV 222 because it was huge and had 6 engines
it was more of a flying yacht than a flying boat