Sorry I cannot help with excursion tips, but I wonder: how are you identiying Grindr lads for hire? I am in highly populated areas in Brazil but cannot sort them out. Are you audaciously, skillfully reaching out and casting the net, texting your openness to both hire and non-hire species, or are they flocking to your profile?
Yes, I did not find PA very interesting either. After some epic fail visits to Mezzaninu, I finally did score with a GdeP who met my type-preference. But the weather was nice and a half-day on-off tourist double-deck bus to the art gallery s/w area on river was pleasant.
Good luck with your adventures!