Hi, if you go to one of the taxi depots areas mentioned in the book, you can easily get to this destination. The taxi depo for Guanabo will take you there. You just have to know a bit about where this location is. Like, if the place is just beside Tarara, then at the depot, you tell the driver you want to go to Tarara. Make sure they only charge you 50mn for the trip. If they see you are a tourist and notice any hesitation in your voice, they will try to boost the price. Stick to your mark of 50 pesos mn.
In the taxi, after you leave Havana, remind the driver that you want to get off at Tarara. He will stop along the highway, at the Tarara exit. It is a short walk down the hill from there. I dont think he will take you all the way to the town. Maybe if you pay him 1cuc extra he would do it. It would only take him 5 minutes extra, but still, in cuba that’s how the taxis work.
After yoga, you should be able to find a taxi in Tarara. There are usually many. You might have to ask a few cars, but there are drivers who will take you back to Havana for 50mn. Just dont leave too late, because the night prices are much higher.
I hope this helps.
Mario