Despite its current troglodyte administration, I love visiting the US: the amazing geography, the inventiveness and energy of the people, and the high standard of living always make for a great trip.
I'm visiting MIT today, then heading for Dartmouth this afternoon. I'm particularly looking forward to visiting New Hampshire, the "live free or die" state. Let's see how literally they take the state motto ;)
The only drawback with coming to the States is the offensive demands for biometrics at the border (as if the immigration and customs process wasn't already unpleasant enough). As Bruce Schneier points out, this US-VISIT program has been an enormous waste of money as well as invasion of privacy, nabbing only 1,000 low-grade criminals at a cost of at least $15m each. Not nearly as intrusive though as the body scanner I tried out going through security at Heathrow.