I have a similar question. The five of us (all adults) will have 11 days between Christmas and New Year's, and we're wondering if we should rent a car, or if we'd have a snowball's chance in hell of either (a) hiring a taxi driver that can fit 5 people in their own seats with seatbelts, or (b) reliably getting bus tickets in/out of Havana e.g. to Viñales, without having to spend 3 days waiting all morning in line at the bus station.
All the cars that I currently see available from the one rental agency (which for bizarre reasons seems to have many faces?) are the expensive semi-luxury (±€200/day) and the more expensive luxury (±€250/day) options. I checked other dates and lots of cars are available, so I guess just everything cheap has already been reserved.
I know that things might change due to the hurricane and repairs, I'm just wondering about generalities from the last few years' holiday seasons. My wife went a couple years ago in late January and had a hell of a time getting bus tickets out of Havana--everything was sold out to Vinales the first two times she tried--and she was just backpacking by herself looking for a single ticket.
For us we're not at all looking for beaches, except maybe somewhere to snorkel one day, but it'd be nice to get out of Havana as 11 days there seems like a lot, even for a family like ours who like to stop and smell the roses.