Already a thread on this btw But I got the game as well, from GAME, only 17.99 though as I'm a student we get 10% off. I love this game, it's relaxing and beautiful you can just swim around to some lovely music (I happen to love Hayley Westenras voice), you also unlock music the more you swim which I realised, when you load up the dive and your char is swimming down the screen from the boat you get to choose your songs (or mp3's) and there are lots of ???'s these change into songs, sometimes you'll be swimming and a new song will start playing
You take people on diving trips, you need to find the fish they want to see, show them good sites, other fishm, listen to them talk and then you get graded, sent items to change your appearance. Also there are photography missions and you can change your lense, the blur, zoom etc and keep them in your album or send them in. You have air but never really run out, it would ruin the atmosphere. I was surprised at how nice this actually looks, it quickly draws you in and I love the advanced controls (the beginning one means you can't go upside down, the advanced lets you).
You can swim with animal partners like a dolphin (won't say any more), feed the fish, draw with the pen as was mentioned to mark spots of interest in the water.
All in all I give this game a 9/10
Problems: Regional online, minor collision detection with the rocks etc but you can put it down to the fact that divers don't run into rocks and shit :P