Fantastic sport climbing unique to Squamish. Two walls of different character. Sharkies is a North facing wall with 9 routes, most are very long and technical on cool metamorphic rock, think a "friendlier" Pet Wall. However, the grades start at 11b. Going-Postal is a west facing wall on typical granite, it has 8 routes going up flakes, corners and broken cracks. The grades start at 10b.
Hwy 99 North from Squamish. Take the "Cat Lake" turnoff a couple km north of Alice Lake. Follow the main dirt road and take your first LEFT up the Brohm Creek FSR, continue up the hill for 6oom or so and park at an obvious large pullout on the RIGHT just after a couple of huge boulders by the road. The trail begins up and right of the parking in the rock talus field. Hike up the left side of the talus field and pick up the main trail up to the walls. The trail does split higher up in the forest, staying left will bring you to the Postal wall, going right will take you to Sharkies, it is a loop so you can hit both, either way.