To my memory, there are viewing areas on either side of the cliff-waterfall, connected via a path. The zoo map shows connectivity, but regardless I doubt we will ever agree.
This very exhibit in Detroit has a new "hot springs" feature":
[ame="http://www.flickr.com/photos/maiac/3267457915/in/set-72157604153861086/"]Snow Monkeys at the Detroit Zoo on Flickr - Photo Sharing!@@AMEPARAM@@http://farm4.static.flickr.com/3456/3267457915_d9e3765d7f.jpg?v=0@@AMEPARAM@@3267457915@@AMEPARAM@@d9e3765d7f[/ame] Detroit Zoo Dec 29th on Flickr - Photo Sharing!
http://www.detroitzoo.org/Newsflashes/2009_Press_Releases/Detroit_Zoffers_$2_Off_All_Admissions_on_Martin_Luther_King_Jr._Day/
I believe the Japanese macaque exhibit at the Central Park Zoo in New York also has a hot tub ...
Nice hot tub for the primates! The Central Park Zoo's Japanese macaque exhibit is arguably the highlight of that small zoo, as the frisky monkeys have a large pool to splash around in on hot summer days.