Zion National Park

If you visit this park in February, you don't need to worry about parking issues. There are parking lots for some trails, so you can explore without stress. The toilets are pit toilets, but they're not too dirty. I recommend going to the visitor center. I felt that the souvenirs were of relatively high quality compared to those in other national parks. It's not possible to see everything in one day, but I was able to enjoy several beginner trails in one day. The scenery is amazing.