Here is a tip I enjoy giving out because it's something we discovered with much joy.
At certain times of the summer it will rain every day in that area... the trails, however, are quite accessible and there is little lack of traction. Most of the trails are embedded rock and the rain doesn't seem to cause much concern.
Also, the storms only last a few minutes and then disappear... but one day I think we counted taking off and on our rain gear 7 times!!
So if it is wet, don't be afraid to try it!