Once there you may; rent a car or SUV at the airport, prices vary - 4 hr scenic drive through the mountains, fruit plantations and down the coast.
travel by tourist van - Travel in Costa Rica - Gray Line Tours Costa Rica or Interbus Online Costa Rica - Regular Shuttle with Interbus @ $40 one way
hop on a public bus - CR Bus Schedule @ $10 one way
puddle-jumper plane service has recently begun again from San Jose to Limon Sansa Airlines @ $140 round trip.
If you don't opt for a car you can rent bicycles to get around by the day or the week right down the road from the house. Motor scooters are available for rent in Puerto Viejo.