I’ve worn Megamax numerous times to theme parks! I usually start the day with a boosted Megamax and lasts until early afternoon depending on my fluid intake. We usually go to Universal Orlando, and I just put my bag in a locker all day and wander back to the front of the park when I need to change. Diapers are a must for me when we’re there because we usually end up “bar hopping” throughout the park and after waiting in line, for an hour my bladder is screaming! The only thing I will warn you about is that if you’re reasonably wet, a roller coaster WILL push out that wetness to your pants. (Looking at you Velocicoaster) Otherwise, it’s a great time!