Regarded as the number one dive site in Ontario by many, Tobermory is the site of Fathom Five National Park and quite a number of shipwrecks. Tobermory is at the northern tip of the Bruce Peninsula, where ships had to weather the cape in order to reach ports in Georgian Bay. Not all of them made it.
Fathom Five National Park requires that divers register before diving in the park; this costs $8. Divers found without a registration tag can be fined. The registration office is downtown, next to the Sweet Shop, so you can go get an ice cream cone after registering. Having at least one ice cream cone per visit is definitely a necessary part of the Tobermory experience, according to many veteran divers.