The sting-rays in the atlantic/carribean are much more docile than the rays over here for some reason. There is a sting ray cleaning station in the lagoon here in SPN, sometimes you will see 10-15 rays at a time lined up there waiting their turn. The dive masters always make sure we start out about 200 yards away and stay close to the surface of the lagoon to make ourselves less of a target.
They are cool to look at, but nothing like the Manta-rays, especially in Yap they are HUGE, and their are often dozens of them!!!