Thank you for the responces!!
We are still sorting this out, but all your information has been very helpful. Yes, my son will be at PUCMM -- he flew into STI earlier today -- assuming his lost luggage is found, all will be well.
Yes, from looking at the map it seemed like we would go through San Fransico de Marcoris rather than going north and then along the coast, but it is hard to know from looking at the maps what way really makes sense. We are also considering a bus, but it seems as though the big companies (Carib, Metro) do not provide service from Santiago to Samana, and going by way of Santo Domingo seems VERY out of the way. Any bus information would also be great -- if we needed a car (or jeep) for the peninsula, we could probably just get on there for local trips. From the reading I have done, we are thinking Las Galeras, but the whole areas sounds wonderful
We still need to figuring out the timing of all of this -- we want to talk to our son about the best time to visit for his schedule -- but you have all been very helpful.