This next Part of your trip is to get to Golfito. Here you have a few options, depending on your budget and time schedule.
Fly with Sansa Air, their airport is right next to the main SJO airport. It is a 45 min flight from SJO to Golfito. Prices range from $80 to $130 per flight. http://www.flysansa.com/
Take the Tracopa Bus from San Jose to Golfito, it is about an 8 hour drive in an air conditioned bus and prices are around $15 per trip. http://www.southerncostarica.biz/Golfito/cat-bus-schedules/Tracopa-bus-schedules-to-or-from-Golfito/251/
Rent a car in San Jose and drive to the lodge. Approximately 7 hours drive. http://www.solidcarrental.com/
Once you are at Golfito, a contact of Lanzas De Fuego will meet you either at the bus station or at the airport and drive you to the Lodge $80 per trip. Approximately 1 hour and 45 min drive.