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Here are some suggestions with a kids lens:
Vancouver Island
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get mid Island then over to the west coast
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Parksville - large sandy beaches to dig in
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ferry to Denman Island and then to Hornsby Island - fossils! https://hornbynaturalhistory.com/category/fossils/
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Qualicum Beach - gravelly and lots of seniors, but a great place to see bald eagles picking up clams and oysters, dropping them to break them open and diving to eat.
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Cathedral grove on Hwy to Port Alberni, accessible old growth forest
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Alberni - old forestry interpretation site with a logging train in the Cherry Creek area
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Drive to Tofino - an adventure in itself
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Long Beach
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whale watching
If you go to Vancouver, many of the classic stops are worth it
- the Aquarium
- Whale watching
- Grouse mountain gondola and mountain top
- Capilano suspension bridge and the fish hatchery and environs
- Seabus
- UBC museum of anthropology
Parksville is likely far more commercial and developed than you recall.
But the beaches remain.