Boya Lake Provincial Park Southern Boundary NOTE - side trip to Boya Lake Provincial Park Campground. East of highway. Boya Lake offers scenic camping and a wide variety of water recreation with its superb water clarity. Boya Lake is also one of the few lakes in the north that is warm enough for swimming. Boya Lake offers two short hiking trails, a mountain bike trail and limitless bays and islands to discover by canoe or motor boat. The Stewart-Cassiar Highway The Stewart-Cassiar Highway runs from the junction of Highway #16 (The Yellowhead Route) north to the Yukon border and connects with The Alaska Highway.This highway offers some of the most awe-inspiring scenery, with wild rivers, deep canyons and wildlife that you will encouter along the way.