rioxtreme, can be contacted via their website, or via email on this link.  by phone, they can be reached at  21.8516.1146 or 21.8516.0636.

rio turismo radical can be contacted via the official website, or via the contact form on this page.

and finally, for all interested in discovering the caves of parque da tijuca, the instituto terra brasil in cooperation with the parque national da tijuca is promoting free, guided tours, every sunday with departure from the park at 9 am.