Grizzly bears do not live on Vancouver Island. The bears you see on these tours are on the mainland side of the strait, in river estuaries at the head of Bute Inlet and Toba Inlet, and the day is built around getting there: a boat crossing of an hour or more from Campbell River, then a short drive or a walk to viewing stands above the river. The salmon arrive in late August and the bears follow, which is why almost every grizzly departure is between late August and mid-October.
Several of these tours are run by Homalco Wildlife & Cultural Tours, the tourism company of the Homalco First Nation, whose territory includes Bute Inlet. Their trips pair the bear viewing with a cultural component led by Homalco guides. Where an operator states that on its own listing we say so; where it does not, we do not guess.
Spring bear tours are a different product: black bears grazing the shoreline at low tide from April into June, seen from a boat that stays on the water. The northern tip of the island adds sea otters, which were reintroduced to BC's coast and are now reliably seen around Port Hardy and Cape Scott.