The warm water of Spider Lake is noted for its excellent canoeing, kayaking and swimming...

The provincial government website notes:

One of the best picnic sites in the area, Spider Lake features a small sandy beach perfect for water lovers of all ages on a hot summer day.
The warm water of Spider Lake is noted for its excellent canoeing, kayaking and swimming and the park is an idyllic spot for a quiet family outing. Paddlers can spend a peaceful afternoon exploring the shoreline and the many secluded bays of this lake, located west of Qualicum Beach on central Vancouver Island.
Spider Lake is stocked with small mouth bass and Rainbow trout, providing fishing opportunities year-round. Powerboats are prohibited but small car-top boats and canoes and kayaks can be launched from the beach next to the park’s small parking lot. Boats can also be launched from a steep banked causeway outside of the park.