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There is a wide variety of rock climbing and bouldering routes along the Lion's Head section of the Niagara Escarpment. Many have pre-installed metal loops. There's a little bit of a legal grey zone, so most professional guide outfits won't take you to the escarpment. If you're going without a guide, you should be sufficiently trained and experienced. Be sure to consult widely within the rock climbing community and carefully inspect any pre-installed equipment. Never tie your ropes around trees; this is endangering ancient cedars in the escarpment area and risks getting rock climbing strictly banned.
Privately owned scenic cave system with hiking trails atop the escarpment and dark caverns beneath it. Bring a flashlight and a jacket. Dogs not permitted, parking free.
You can do this anywhere with a clear night sky, but every Friday and Saturday night during the summer, a local group of star aficionados brings their telescopes down to the marina, and gives talks while allowing you to see some spectacular sights that are inaccessible to the naked eye.
There's no storefront, but you can call to make a meat order, or pull over on the side of the roads around the farm to take a look if you want to see a herd of farmed Canadian bison. (This is not a tourism operation, please don't get in the way and don't call with tourism questions.)
Park at Hope Bay (access via a ladder) or at Sydney Bay (access via stairs) for a ~8-km loop along the top of the escarpment. The south side of the trail is hilly and a bit overgrown, while the north is relatively flat with beautiful vistas. Please be Bear Aware!
A pleasant walk along a well-maintained section of the Bruce Trail to a series of stunning lookouts over the Lion's Head harbour. Other sights include 10,000-year-old glacial potholes and small caverns. Approximately 4 km each way, with some rocky sections.
A nice section of the Bruce Trail culminates at a 6,000-year-old upturned "flowerpot" rock formation. You can follow the small creek and waterfall down from the monument to an isolated pebble beach with crystal clear waters, or continue along the nearby trail and side trails to do loops of various lengths.