I dont myself work in a resort but live here as spouse si will try to answer somw of your questions, based on what I see happening here!
salary seems realistic - in our resort on a f&b manager position this is what you have access to: own room (I am the only spouse in our resort, but I know lots of resorts where it's not the case!) - the issue with your fiance is probably more the title, as in she is not your wife... I am not sure you will be able to get a residency for her if not married - but you have to check this I am not sure! all water sports, inc diving (except padi or other certificate you obviously have to pay) . you would be full maintenance so no expenses (food, drinks(check for alcohol dont know - but should be) - clothes washed, appartment cleaned. if you can bring your fiance same for her. for the work it is something you have to ask for, but then she would have a seperate work permit...
my husband works 6 days a week, is gone at 8am, if lucky we have dinner at 9:30pm... so I see him, but not a lot lol - and yes we do have internet just not the best of the best!
have a look at my blog if you want to see some pics, dont know if I can post it here, but the link is on my profile.
if you have any questions you can always pm me!