One thing you should do is take in the One Love Drive Pub Crawl. The One Love Bus will pick you up at your hotel in the early afternoon; you will visit about 6 establishments on the West End (Cliffs) and return you to your hotel shortly after sunset. The bus is free, but the driver does take tips (suggested amount $10.00 US per person. You will need to take some cash to pay for your drinks and/or food while on the pub crawl. You will meet some fellow travelers and see some great bars with great views and atmosphere. It's a safe way to see a part of Negril that you probably wouldn't otherwise see and its a lot of fun. Here is a link for info on the pub crawl.
http://negril.com/nt/nt103013.htm