Luminous Lagoon is fun, but it is a REALLY far drive from Negril.

If cost is an issue, you can't beat Roaring River and Blue Hole Gardens -- 50 dolllars for a private driver (if you know how to bargain), six dollars to enter Blue Hole Gardens, and it is just amazingly beautiful, plus you get the river there, too.

Also, you do Rhodes Hall practically for free -- 100 j cab ride per person, five dollars entrance fee -- and it's not only super nice there, but it only takes 15 minutes, so theoretically you can that PLUS another excursion .....

Pelican bar is not worth the long drive IMHO ....