My aunt/uncle live there full time and I love it down there, my goal is to move there when I get enough passive income to live off. They rent out their house in san diego and live off that, along with retirement moneys.
My aunt has leukemia and actually gets her $200/day medicine for free down there. Medicare and her private health insurance don't work outside the states, so she was able to show hardship and gets it for free.
They have 85 acres of jungle they've owned since the 1970's and bought a house when they moved down there full time in the mountains in a place called: San Juan de Puriscal where it's in the 70's year around. Decent house cost $60k and he has a full time skilled construction worker constantly building shit for $4/hour
Puriscal is nice, up in the moutains away from the big city but close enough to run into town. Atenas is similar but much more accessible to San Jose (now that the highway is built out to the beach - 45 min from SJ to the sand).
Back in the old days, lots of really nice property here for pennies. Locals have been educated though and don't give away land anymore, but if you look around and play hard ball you can still get some decent deals.
I have private health insurance here and it's expensive $3K /yr, but they cover 90% of the cost of most things including meds. You can go through Caja which is government insurance and get everything for free but there are ups and downs to that.