My sons are 14 and 10 years old, and we did the river tubing with cave exploration, climbed the waterfall caves (and jumped off the top), and explored local ruins that still allow visitors to climb all the way to the top of excavated temples. Group sizes are very small ...
The main terrestrial biomes found within the country are Amazon forest, Brazilian savanna (cerrado), wetlands, scrub forest, Atlantic forest, and grasslands [51]. Around 5% of Brazil's territory consists of carbonate caves [52] totaling more than 10,000 caves of different lithology types [53]...