I used heat shrink tape on my underwater camera cord. Also their is a waterproof plumbing tape called stretch and seal.
I would use the plumbing tape first then put one coat of the heat tape on it.

Where are you staying at? I like hunters point resort. I use Tony Roaches web sight and check his on air report. I have gone fishing with him many times and also other friends have fished with him. Always is on the fish and he knows what is going on with them. He also only charges $150 per person for a full day guided trip. Then once he gets you on some fish or shows you areas to go you can go back to those areas the next day. Well worth the cost.
http://www.roachesguideservice.com