First time going anywhere!

Ladies this is my first time leaving Houston, Tx. My cousin asked if we wanted to go for spring break since his kids will be on break. He will be taking them to the universal something (rides). I don’t play games and I’m too scared to get on rides so we think we’re going to go but do other things. We will be driving in separate cars. What I was wondering is what should I bring and what should I check on the car before going? Our car is used that’s why I’m asking. It’s supposedly estimated 13 hours but with stopping to eat and all maybe 15/17 hours my cousin said.