Keep driving along the paved highway to the City of Nicoya (large town). When you are almost to Nicoya, you will come to an intersection with a 4-way red flashing light - there will be signs indicating a left turn into the town of Nicoya.
Drive straight through Nicoya on the "main road"... No turns. Drive slowly, as there are a lot of pedestrians in this bustling town. You will eventually exit town on the other side. Continue driving southward on the paved road approximately 30km. There will be some twists and turns, but just stay on the main paved highway.
Eventually you will see a large Gas Station on your left. There is also a hardware store and little "soda" cafe for snacks and drinks. Stop here and get gas... it's the last chance on your way to Nosara!
Right after you leave the gas station, the concrete highway makes a sharp curve to the left. At the apex of that curve, you will notice a small dirt road turning off to the right, downhill. Turn right onto this road, it is the road to Nosara.
This dirt road is about 25KM, but takes over 1 an hour to drive.... There are more turns and twists, but stay on the "main" road. You will pass through many small towns and villages. At the T-intersection, turn right (there is a sign pointing to the right to Nosara).
Continue about ten minutes past the seaside town of Garza, then past the Nosara Yoga Institute on the left, then Nosara Development (Play Giones). Keep driving past the Playa Guiones area, following the signs leading to Playa Pelada on the left, At the crossing, where five roads meet, look on the left for the sign to Nosara B&B Retreat ( If you pass the new gas station, you've missed the turn and gone too far.) The most direct route is taking the road up the hill, continue along until you see the yellow concrete pillar on the left, go left down the hill, and then take an immediate right turn and then an immediate left into the driveway with the sign, Nosara B&B Retreat.