as a ''newcomer'' in Tobago I would do first a island tour with one of the guided tours, to become a better impression.
I can recommend YESTOURISM in Lowlands, they give you a professionell service and full overlook about all the activities you can do on the island. http://www.yes-tourism.com
After you can discover at your own....maybe with a rental car.
All the nice beaches are in a driving distance from your hotel.
You will see.....it is easy an save .....and not so busy like in Barbados.
If you like it real independent....you are on the right island
Cool down & have fun
Peter......two month to go