I feel comfortable on whale & dolphin watching tours. There are federal laws that dictate how close a boat can get & how the boat can interact with the animals. I've read & agree with the laws, so I am comfortable taking a tour.
From my experience with various tour companies, these captains are out every day and have a respect for the animals.
Dolphins are friendly & curious animals. It's likely they will come close to the boat & as long as the laws are being followed (no feeding, no attempt to touch, etc) it is a magical experience.
AFA a portion of the ticket price going to support the aquarium, the larger ones in my area take in injured animals and I am comfortable supporting that.