Sorry, couldn't resist, they call it a head.
And on almost every dive boat it seems to be broken, or won't take solids. At best you will get "if you didn't eat it, don't put it in there". Including TP.
If you want a boat that isn't a cattle boat check out Kona Honu Divers, great crew and a 46' boat that never seems to be crowded.
Check with the boat to see if the Manta's are there, they aren't always and it can be disappointing if you don't see them. Of course its a real nice night dive nd they usually do the eel garden whichis kind of neat to see.