I've never taken the catamaran sunset cruise but have seen it go buy many times. It seems like a fairly short trip with not much time at Ricks and is usually headed back before sunset. I would suggest taking the Pub Crawl and getting to know more of the west end bars and restaurants instead. Overall the pub crawl will probably be MUCH cheaper and you'll get to experience a lot more of Negril.
A cab rid to Ricks should cost about $10 each way. Don't use a driver from your hotel. Hit the road and just start walking. A cab will find you soon enough. Make sure you negotiate the price of the ride before you get in. You can also arrange a ride from any of the drivers in the negril.com transportation section if you want to plan ahead.
