You've visited a lot of the tourist locations, which is a must if you're visiting for the first time. It seems like you enjoy nature and outdoor since the best part was Grand Canyon for you. If you ever visit Las Vegas again, an hour drive away is this beautiful state park called the Valley of Fire. I think you would enjoy it! Also, there are so many beautiful hiking trails all over California. It's not just shopping centers and movie sets here. :) I hope you enjoyed your stay in the US!

If you are interested, here's my blog post about the state park I was talking about earlier:
https://steemit.com/photography/@sweetfin/valley-of-fire-state-park