It's off the beaten path a bit from the RIU experience, I'd be sure to grab some jerk chicken from a roadside vendor. It's just...better!

Also a few other tips:
Carry small change from the airport to the hotel, for tipping, or to use when your bus stops for a bathroom/beer/refreshment break. I'd suggest $100 US in $5 and $10 bills, with some $1s, too. This way, you can be sure you won't lose too much cash on the exchange.

Clive's is a great choice. Since you're using him, take advantage and equip yourself. I'd suggest getting a Jamaican cell phone from the driver, they are around $20 US for a week and make it nice for calling home, or for calling for yours, delivery, cost-wise it beats using your own cell or room phone.

Take a walk on the Seven Mile Beach. A simple "no thanks" will keep the vendors off of you, and the walk will expose you to some of the famous beach life and properties you read about on this board.

Have fun. Smile. Be firm. Pay about 70% of what you normally would..or less...for goods and services.

Enjoy!