Going to US for 3 weeks

I'll go to the US for 3 weeks, what should i do that i can't do in europe ?
I already planned to use some GCs/accounts to buy shit. dominos, delivery, starbucks, any other idea ?
I already want to see concerts of people i like but none are at the good moment, do you know a good one that worth going ?
Anything else ? haha

Thanks