Flying can save us a lot of time if you can afford the expense, in addition there are some cabotage airlines that offer a kind of “flat rate” for one or two weeks.
The airlines Costa Ricans are safe and reliable, with new aircraft and high flight frequency. If you don’t find your ideal flight, whenever you can, there are air taxis.
Think that this small country has nineteen domestic airports and many others airfields minors that facilitate travel. Of course, when you arrive at your destination you must solve your arrival at the accommodation, but you can check if they have a transfer service or, hire a taxi.