Yes.
You are wearing a floatation device the entire time, your wetsuit.
For the stingray lagoon, you float on the surface and look at all the fish thru your mask. If you want to put your head under water, or dive down, then you can. If not, then that's fine.
For the Dolphin swim, you are standing in waist deep water, and only go out to the middle for a ride back to the shore. And even there, you can request a "slingshot ride" where you start from the shore, go out, and come back. You don't have to go underwater during the dolphin swim. If you want to put your head underwater and look around, then fine, if not, then that's ok.
For the lazy river, your wet suit keeps you above the surface. Same thing, you look around from the surface with your mask on. If you want to dive down, you can, but it's hard because your wet suit will bring you back to the surface.
Final answer, Go, it's worth it.