I'll add my two cents. I just got back from a week in Coz. I used the dive op's BCD and reg, I brought everything else. Did this because they included free gear rental with the diving, and by leaving my BCD at home I saved on checked bag charges.
In general, my priority list for diving in the Caribbean:
Must bring, can't dive without:
Computer (it's on my wrist)
Mask (it fits well... and it's prescription)
Always bring... but could get by without:
Neoprene (I have a closet full of suits, one for any occasion)
Fins (my warm water full-foot fins fit perfectly... I'd never risk using rental fins that don't fit well)
Mesh bag (difficult to appreciate how useful this is until you don't have one to use)
SMB/reel/whistle
Sometimes bring, sometimes not... just depends:
Regulator (I like my reg... but I don't mind using a rental, as long as I'm breathing)
BCD (I like my BCD... but I don't mind using a rental.)
I usually bring my Gopro and a couple small lights. I left gloves and knife off the list because I don't bother bringing them to Coz. And trying to bring a knife anywhere is impossible if I'm not checking luggage.
In general, my priority list for diving in the Caribbean:
Must bring, can't dive without:
Computer (it's on my wrist)
Mask (it fits well... and it's prescription)
Always bring... but could get by without:
Neoprene (I have a closet full of suits, one for any occasion)
Fins (my warm water full-foot fins fit perfectly... I'd never risk using rental fins that don't fit well)
Mesh bag (difficult to appreciate how useful this is until you don't have one to use)
SMB/reel/whistle
Sometimes bring, sometimes not... just depends:
Regulator (I like my reg... but I don't mind using a rental, as long as I'm breathing)
BCD (I like my BCD... but I don't mind using a rental.)
I usually bring my Gopro and a couple small lights. I left gloves and knife off the list because I don't bother bringing them to Coz. And trying to bring a knife anywhere is impossible if I'm not checking luggage.