The mountains, the ocean (though I can adapt to that -- did it in college), the food (haven't found Mexican food that's anywhere near as good as CA or AZ in WI, there's even access to local Hawaiian type food in CA, but not here), the people (people in WI are nice, but they mostly just want to stay here, some don't even seem open to traveling). I don't mind cold, as long as it's not beyond freezing for months.
After growing up in So Cal, HI, and college in AZ, I like to do stuff year round. I really don't like it when it hurts to breathe.