The tours in Punta Cana which can be found for below 50 USD are mainly dune buggy adventures, but there are some further more recommendable options offered. Consider my comprehensive Isla Saona information to have to be aware of the variances amongst the different Isla Saona excursions from Punta Cana. https://punta-cana-excursions18395.anchor-blog.com/11134960/punta-cana-excursions-an-overview