Hello Pat
Welcome aboard!
I shall have to leave it to someone else to recommend good reading map on plants, but you could be in luck on the guide side. William Trim has just returned to the island after completing his Masters degree in the forests of Guyana. He's a native Tobagonian and one of the island's top bird watching guides, but his specialist fields are agro forestry, tropical forestry, dendrology and silvculutre in particular.
You can contact him via
[email protected] to discuss the possibilities. Other than that, I would suggest Newton George, (
[email protected]) the island's top bird watching expert, but who has just retired after some 30 years as a Forest Ranger. He may best be known for bird watching, but he is totally expert in everything about Tobago's flora and fauna.
You never know, we might bump into each other at the Cuffie River. We're staying there to do a review in late January.
Direct flights to the island started in 1992 and the Grafton was built, I believe, in the mid 80s. You won't be surprised - once you get away from Crown Point remarkably little has changed.
I'm intrigued by your comment that the road to Charlotteville came to a stop just north of Blue Waters. I can only think that there must have been a landslide, or something, blocking the road. I have been travelling that road through to Charlotteville since the late 50s. I still recongines some of the same pot holes.

Mind you, if you were trying to get to Charlotteville from the north side of the island, yes, the road came to a complete stop just north of L'Anse Fourmi. They started building a road between L'Anse and Charlotteville back in the early 60s. The basic engineering was finished and a base for the road laid. Then Hurrican Flora came along and caused immense destruction in '63. The road gangs were diverted to more important restoration work and, being Tobago, were not put back on the road until the next century - i.e. two years ago. It is not officially open yet, but you can now get through with just about any vehicle. Never having made the journey, it's on my "must do" list for our next trip.