What is the cheapest way to get to this hotel from BZE airport?
You take your vacation in your hands with this car service. Rent a car and drive - just be VERY careful about the 100 speed bumps (will rip your undercarriage out) along the way---they are not all marked.
BZ Shuttle is a car service based in San Ignacio. They have a website and you can ask them about prices. They're good, and less expensive than others.
Renting is a good way, but could be pricey. It's about a two hour drive. Or just go as a local and ride the bus. Cheaper too.
I would rent a car and drive. It's only a few hours.
The bus is the cheapest option, but very few tourists choose it. Our group of four rented a car for 5 days (from Crystal Auto Rental at the airport), which was about the same price as getting the hotel's shuttle service to/from the airport. Taxi's are about the same price as the shuttle.
Get an answer from San Ignacio Resort Hotel staff and past guests.