Observation platforms or terraces

The suspended deck is the key location to a zipline circuit. 

It offers a place to escape, to be lulled by the wind  in the trees, A platform gives an unparalleled point of view, that lets you see the flora and fauna from a different perspectiveThe size and design of platforms or observation decks vary depending on the trees and access to the site.

As with a treehouse, they also can be accessible in many ways via staircases, ramps, secured bridges, walkways, or zip lines. 

Like a conventional terrace, just about anything can be added; benches, BBQ, a hatch access or a gazebo.