The Beaver,

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I met a father/son combo that had portaged sea kayaks over the ridge on the NE end of the island, just across Tobin Harbor from the Rock to Tobin Harbor portage.  I think there is at least a 300' vertical at that location. But it is the quickest way to the nice sheltered coves and bays on the north side. Campsites consist of several groups of tentpads sharing a common latrine, but spaced far enough apart to give line of sight privacy.  From the Lane Cove campsite, you can hike to the Mount Franklin overlook in less than an hour.  Lookout Louise offers a nice view of Five Finger Bay.

-YB