being in the diving biz , hotels always want a cut , the person you need to speak to is generaly up the feeding chain in the hotels , be it head of animation or the manager himself.
Ask who in charge of excursions, may be they have there own excursion office
hotels want between 10 and 20 percent of your biz dependent of the hotel,
so managers like a bit of a sweetner, to go along with your percentage.
this is the tourist biz even getting into tour operaters is a mission and will cost you a percentage.
loro park has it sewn up with its publicity they pay top doller to be there.
cheers
mark