Anyone can call him/herself a tour guide.
Here's a list of knowledgeable and environmentally sensitive guides.
David Rooks - P. O. Box 348, Scarborough, Tobago, West Indies (868) 639-4276 (speciality: birds)
Pioneer Journeys - Pat Turpin, Charlotteville, Tobago, West Indies (868) 660-4327
Renson Jack - Delaford, Tobago, West Indies (868) 660-5175 (speciality: plants)
William Trim - Goldsborough, c/o Goodwood Post Office, Tobago, West Indies (868) 660-5529
Newton George - (868) 660-5463 (specialty: birds)
This list is far from comprehensive. We presently have no mechanism by which to evaluate tour guides. The above guides are known to us or have been recommended to us. So there are probably highly qualified guides in Tobago that we just don't know about. We advise that you choose your guides carefully. The Tobago House of Assembly conducts a tour guide licensing programme and we recommend that you hire only those guides who can produce this license. This license alone, however, does not indicate that a guide has any particular degree of knowledge about Tobago's environment.