The mouth of the Oyster River is bar none the best place I can think of. Also in front of the hospital in comox on a high tide, the seals chase them in to the flats. A bit further north is in willow point just after the Oyster River log cabins on the old highway, about 1/4km there is a huge bay that is completely dry at low tide and when it floods, there is awesome opportunity especially if you have a belly boat, canoe etc right from the highway.