I happen to be there (here? In the US either way) right now. I agree with almost all the comments so far. I holiday in many places but the US is amongst my favourites. A long list:

Beautiful scenery, yellowstone, yosemite, the Rockies, the lakes, deserts...

Friendly people - was at a B&B chatting to a bunch of Texans till the wee hours last night.

So many rules and laws and customs I like - turn right on a red being right at the top but also 21 drinking age, children calling adults Sir, the focus on manners in many parts of the country....

A climate for all seasons somewhere or other in the country

So many cultures from pueblo to new Hampshire, from Hispanic to gringo.

I'm not all rose tinted glasses though. I hate the right wing politics of some, feel desperately uncomfortable with the gun culture and cringe at the plastic sincerity which is so common. But the point is that I can live with those for the many benefits.