Just returned from our trip to and around Costa Rica. I will be posting a trip report, as time permits (back to work in the am), in this thread. Some stuff will be specific, some not so much, as I took notes each evening for a while, then kind of stopped doing so.
This trip was me (47), my wife (not telling), our son (16) and wife's father (mid sixties). Wife, son and I were in CR in the same timeframe back in 2014. This was first time in CR (and I believe first non-cruise foreign trip at all) for father-in-law.
We stayed in motion, for the most part; it was planned intentionally, to get tastes of lots of different parts of the country. It works for our wishes, but if you are the sort that likes to get more thoroughly acquainted with each area, and likes more time to smell the roses, you won't want to copy. Bear in mind also, regarding the amounts of time I allotted at different places, that we were skipping the adrenaline type activities (other than a few that my son and I did alone).
There were occasions throughout the travels where we went against a few of the usual recommendations/warnings that are provided here - some of those were planned that way, and some just worked out that way. Don't take them as suggestions or recommendations or arguments; I'm simply telling our particular story.