Verified answer

Randy, this company has shuttles from Montezuma to Samara. Maybe if you contact them you can arrange for a trip from Samara to Montezuma:

http://www.montezumaexpeditions.com/transfers.htm

I have rented a 4x4 in August (rainy season) and drove from Montezuma to Samara to Tamarindo thru the rough roads, instead of the freeway. This was fun, I crossed 3 rivers and saw so many animals, such as white faced monkeys, cows, birds, iguanas, exotic looking racoons, any other animals as I drove along. There is no buses that goes that route from Samara to Montezuma, I suggest renting a 4x4 if possible and stop nt Tamarindo as well like I did, you will not regret it.