I have used on numerous occasions a very nice guy named Rafael. His cell number is 809-775-9815. He speaks english, has a good-condition Toyota station wagon and is responsible & polite. I hope this info helps.
I spoke to Rafael yesterday. In addition to the number I provided in the earlier post, he may also be contacted via e-mail rafav@hotmail.com. He may not be the same Rafael as mentioned in the other postings because the Rafael I refer to does not smoke. His rate as a tour guide is RD$1000. per day, less if used for more than one day. Subject to negotiation. I wish you an enjoyable vacation.