I don't play very much during the day, so my character doesn't get tan. If you want your tan to go away (or don't want to get a tan) and you play a lot during the day, just walk around with an umbrella. If you play mostly at night, you won't get tan since there's no sun at night.
I did end up with a tan back in February. One of the towns I visit keeps their clock 6 months & 12 hours behind (that way, there's always an open store to go to and different bugs/fish to catch and events going on). It's actually a few years behind too, so we can get the old New Years shirts. When I was in that town in February real time, it was August game time and I was there for a while catching stuff. Everyone who visited that town ended up getting so dark. LOL. After a while of walking around with an umbrella, my tan went away. But some of the other people stayed dark because they didn't use umbrellas.
Has anybody received the Dolphin model DLC yet? Delivery dates are 7/20 to 8/3. I haven't seen Pete except during his normal mail delivery times.