Welcome to the forum Collin and Sandra Hunte!
Those are great questions and I hope we can fill you in with the right answers. I think you are wise to consider Costa Rica vs. Mexico and I think Costa Rica has the edge, especially as you learn the language and get settled in.
Do most people fly down and keep a car there? How do you get from the airport to your home?
That's hard to answer, because it's probably mixed. If you live in a gated community that has on site management, you could probably store a car for 6 months with no worries. Some people probably wouldn't want to bother with the mechanics of storing the car for that long or they don't want to worry about it, so they probably don't bother with a car and use public transportation. (which is very good in most areas by the way) In the end it will probably depend on how accessible the property you choose and on your personal preferences. This applies to the airport question too. Some gated communities would offer pick up and a lot of people rely on friends and neighbors. If you are in a more remote location you may end up renting a car or paying a private transfer service. I believe some beach communities have established airport transfer services that are informal (unlicensed).
What is medical care like?
In San JoséThere are well established private hospitals that offer world class medical care. The public health care system is a universal system. The biggest problem is the red tape and getting in to see the doctor or getting medication. My experience has been that the doctors and nurses are very competent once they actually treat you.
We are interested in a holiday village type community...
Recently a number of successful communities have been developed in Costa Rica, as opposed to 5 or 10 years ago when there were almost none worth purchasing land in. From what you describe, I think that you would be interested in the Jacó Beach area.
Resort Communities near Jacó From there you can find out more about that area and contact Ronald.
Another good option would be to look at condominium properties that offer a rental pool. This is where you can live in the condominium as long as you like, but you can also turn it over on specified dates for vacation rentals. In your case you would occupy during 6 months the condominium and allow it to be rented for the other 6 months. The on site management would take care of all the maintenance and rental duties in exchange for a commission that varies from community to community. The advantage is that you can earn money on your investment while you are away and you also are able to use the condominium when you wish. In Tamarindo Beach and Langosta are some complexes and communities that offer this option. See the ABC website for details:
ABC Real Estate Tamarindo
Have fun in the sun and please come back with more questions!