I think this is a little bit of a unique case, simply because (at least for US citizens), Cuba is not 100% accessible. What Birding Havana is offering is a fuller cultural exposure to Cuba and frankly that's a good thing in addition to the birding. The cars are a quirky (and fun for some) result of Cuba's political history and frankly, everyone I've known who has visited, had fun doing a city tour in a 50's classic. I'm sure you know all this Andy, so if it's in the wrong forum, he just needs to be told to relocate it ;-)