There is a Jamaica Tourist Board (JTB) office right there on the Hip Strip. It's located East of Doctor's Cave Beach (direction towards Ocho Rios). The official address of the office is:

18 Queens Drive
Montego Bay
St. James
Jamaica, West Indies
Tel: (876) 952-4425
Fax: (876) 952-3587

You can get the best Jamaican maps from them. They also have taxi rates for each city, though you can negotiate the prices below what's given on this rate chart.

Also see: