The capybaras have access to low grassy areas around both the woolly monkey and yellow-breasted capuchin exhibits as they can swim underneath the visitor pathway. The capybara indoor housing is connected directly to the capuchin exhibit however.
The link below gives some very good and detailed information on the monkey islands in the Amazonia area at GaiaZoo. There have been some changes since this page was written (different capuchin species, no more marmosets with the woolly monkeys) but the general structure is still accurate.
