In Tofino, there are a number of whale-watching tours, so honestly, just pick one. They are all about the same cost and they work together to ensure that all the customers get a good look at whales.
The tour was 2.5 hours on a Zodiac, with much of the time spent watching for spouts. When we would see one and approach it, I tried to imagine how the whalers in the tall ships managed to spot whales and close on them. Boy, they were good.
The best time to go whale watching is in March and April, with mostly grey whales in the area, although there are the odd sightings of Orcas and humpbacks. We also go a good look at other sea mammals, including sea otters, sea lions, and, of course, harbour seals.
The side trip through the mountains on a very windy at times road to the west coast of Vancouver Island to go whale watch was well worth it. Enjoy.