How good are your non-diver friends at snorkeling? On our dive, there were several families who had their kids snorkel above. It's only 14' so they were able to swim down briefly also. I've heard the DM's now are the only ones who feed the Rays (post Steve Irwin) so the appeal of doing that at Sandbar might be gone now also.
Soto's
closed in 2005. They took a hit during Ivan and never recovered.
Grand Cayman & Bob Soto’s Diving - End of an Era : Eyes On Living