Access Topside Mutant Snail Warm-Up Boulder from the Silvermine Car Park. Walk towards Muizenberg on the dirt road going right past Shady Nook. At the river, you have a few options. The first is to stick left and before the Crute Boulders go right. The other is to go right and left up the next valley. If you are unsure how to find the Mutant Snail Boulders, please view or download our Cape Town bouldering map for clarity.