Absolutely it's worth the time especially if you enjoy golfing together. The course is not like the lush green manicured courses many of us are used to in North America but it's an enjoyable, challenging, somewhat tight, hilly course. If you're used to walking, I would suggest not getting a cart. With caddies carrying your bags, the hilly course provides a good little workout but it won't completely exhaust you. If you're early risers I would suggest highering a "cab" to get you to the course for a 7:00am start, the taxi cost is about $40US return including tip. With just two of you, you can miss the heat of the day on the course and be back on the beach by 10:30.
My wife and I have handicaps similar to yours (14 and 30). We were so into being on vacation and enjoying the Jamaican vibe that we didn't bother keeping score the two rounds we played... which made for two very relaxing rounds of golf.
I agree with Roclin. I played Negril Hills with two buddies back in Dec 08. We are two 20 and one 7 handicapper. Our wives don't play so we took the opportunity to play 18 holes twice. We walked the course with our caddies and had a blast. I suggest that you walk if you're in decent shape. Also bring a dozen cheap golf balls with you. The fairways are hard and it's easy for balls to keep bouncing and get lost on some holes. You can also buy some experienced balls from the children who hawk them on a few holes on the front side. Two of us brought our own clubs/shoes and it wasn't a big deal travelling with them. The rental clubs weren't too good when we were there but I have seen on this board that they may have upgraded some of them. I like playing with my own sticks and always bring them when I travel and plan to play. Well we got our golf fix and yes it was worth every penny we paid to play. If you play ask for caddies Ronnie and Nevel and tell them Steve from NY says hello.