REGUA is a wonderful location that is a 'rewilding' of previous agricultural land. There is water, easy trails and a magnificent assortment of birds. One night we were able to join a group searching for a great snipe, and also had a marvellous encounter with a calling potoo. There were a willing group of staff and volunteers who were more than happy to share their knowledge and experience.
REGUA is not on the beaten path of most of the tour operators, but we would recommend a visit. The staff can arrange pick up at Rio, and the accommodation is fine, and the food simple but good.