Should i go to hurricane harbor with my friend's family?

my best friend asked me if a wanted to go to hurricane harbor with her family (little bro,her, her mom) on friday (her birthday). she has a guest ticket and really wants me to go. i don't know if i should go because its like her own family trip and i don't want to butt in. her brother doesn't want to bring any of his friends. so should i go or not? thank you in advance.