My favourite film of all time is Jaws.
I hold an interest in Shark movies generally as a result but bar a few, in the main they have just got progressively worse and worse which is a shame.
But I really enjoyed this too. Not too long, fair degree of action considering she's essentially stuck in a bit of a chess game with the shark, and as you say, visually beautiful.
It didn't feel like a cheap, straight to DVD film either.
And Blake Lively is gorgeous.