Actually I DO use Granite Falls and Selvadorada, in nearly every game. And I would love a winter destination- a winter vacation to Granite Falls is pointless, because the river is frozen and the plants and bugs are dormant. Selvadorada is very rainy in winter, which doesn't stop you from exploring the jungle, but it does stop your sim from enjoying any part of it. So, yeah, a destination BEST visited in winter would be awesome.