Is a GoPro worth it?

Hello everyone!
I am interested to know if buying a GoPro would be worth it. I’m going on a cruise in a month or so which will consist of a lot of water activities. These include snorkeling, kayaking, etc.
I currently have a canon t3i which I love! I use it a lot but mostly for landscape and family photos. During this cruise, I obviously can’t take that camera underwater so I was thinking of buying a GoPro but the one I want is a bit pricey and I don’t want to waste money. I’ve been researching stuff about it for a little over 2 months now!!
I take a lot of pictures during my trips and I try to go on a vacation every summer.
What do you all think?