Saw this in the toronto Star. For anyone enjoying an adventurous day hiking, trekking this would be the place to go.
It's "a bouncy stroll across a canopy bridge". See http://www.haliburtonforest.com/canopy.html.
It's a 4 hour adventure involving a paddle in a voyageur canoe, a short hike and then a walk 25 metres above ground on a walkway. The fee also includes admission to the Wolf Centre indoor observatory.
This area also has mountain biking, an observatory to view stars and camping.