Welcome TKim! I don't post often but I"m here quite a bit. My husband and I stayed at the Caves for a few nights in December and I"ll be happy to share what I know with you.

I feel its safe to walk just about anywhere during the day.

Can't help with the spa..not my thing, but I"ve heard great things about their massages etc.

WE did do the Cave dinner. I have mixed feelings on it, it was a cool experience but I was kind of disappointed in the meal, nothing special. I'm not sure if its true or not, but I"ve read that they are now charging extra for it. It was included in our stay(of course a really nice tip was given)

And as far as tipping, I think we left a tip for the housekeeping everyday but waited until the end of our stay to tip the rest of the staff.

We saw the Rum Bar but it wasn't open at all while we there. We did talk to some people that said they made their own party down there one night.

Wifi was sketchy. Couldnt get it in our room, but was able to get it in the main breakfast and dining areas.

The Caves as on our bucket list and I"m glad we got to expereience it.But like you've discovered while reading this board,the cliff area is full of great places to stay and eat that it was most likely was a one time experience for us. I"m sure your going to love it and I"ll bet this isn't your last trip to Negril! What room did you book?