The one in central Habana (where the Grandma is displayed) is almost a walkaround garden, a lot can be seen from outside but do not expect anything like the IWM or the Smithsonian.
I haven't been at the Bay of Pigs but I came across a disused airfield driving from Baracoa to Ciego de Avila. I literally crossed a concrete pavement and looking left I could see some Frisia's horses blocking what once was a runuaway, so it is a safe bet that there would be something rusting away there. If I can come up with coordinates I'll post again.
Then one day while sunbathing in a cozy beach just off Baracoa, the ever-green AN-2 came up from behind, at tree-top height...
Enjoy the trip, I LOVE that country!