Something to keep in mind is that the culture here is different per state, city and maybe even neighborhood depending on the city. It's a big place, especially out west, usually my foreign friends struggle to realize how far away things are (hours or days of driving). On that note unless you live in a huge city like NYC having a car is almost necessary, it's just the way the infrastructure was built in the 60's and very few places have updated it since then.

Probably the things you will enjoy the most will be the food. Try some ranch dressing, get a cheeseburger, have some regional specialties like BBQ(every state does it different), Cajun or even pizza (NY style is very different from Chicago).

All of that said, my favorite thing about the US is the national parks, especially out west they are incredible. Some of my favorites being: Zion, Bryce Canyon, Yosemite, Yellowstone, Arches, Monument Valley and the Grand Canyon. Even people that live here not many have had the chance to see these places, but they can still get crowded depending on the time of year.

good luck, I hope you have a great time.