I understand, based on being involved in discussions of the expansion of the Jarabacoa golf course, that, real estate costs excluded, the cost of building a hole is around $100,000.
Add the cost of roughly 100 acres for a full size par-72 course and the cost of clubhouse facilities, easily $1,000,000+ for land in a decent location and $500,000 for club facilities and the investment is enormous, around $3,000,000+.
I'd be surprised if enough demand can be generated for Samana to make such a huge investment viable. A par 3 would still require a massive investment.