I've been a mountain biker and tour guide in Tobago since 1998. I've ridden around this island a few times and consider myself a unabashed 'Tobagonian Cyclist'.
Anyway, if you wanna stick to the main roads while cycling, a normal tourist map is fine. In my opinion, the roads along the coast are so easy to follow one does'nt need a map. But if you want to explore inland and trails that's a different story.
My buddy has been conducting mtn bike tours and rentals since 1999. He's on MyTobago, i think. Slow Leak Mountain Bike Tours. Contact him......because honestly the best person to ask is a cyclist. It does'nt make sense to ride a road bike or crap mtn bike cus even the paved roads are bad.
As for busy paved roads....that is true. But as any cycling tourist to a tropical island would knwo....you ain't comin here to ride in the congested,busy, car filled capital.
Yes some people drive like idiots, yes some dogs are evil and run you down like crazy but I like gettin home after a long ride then do some yoga and look in the mirror at my tanned figure and my shapely legs and !!
Tobago is an awesome place to ride.The naysayers can talk but I've never seen them cycling on 'Sweet Man Trail' or flying down to 'Coker Trace' or spinning through our Mangrove forests! I've ridden trails in the Uk and the US and can say that Tobago's got some great riding.....to bad the people here don't even know this yet!
Good luck down let the gas guzzlers bring you down!!