Fall is a stunning season at Lake Tahoe. It's quiet; the summer crowds have gone home and it's too early for skiing. The aspen leaves shimmer like gold coins, the days are crisp and the lake, at least in September, is as warm as it will be all year. Hiking trails beckon, bicycle trails wind through the tall pines and golf courses offer invigorating days of pleasure and fun.For a fall getaway, the serene North and West Shores of the lake recall what Tahoe used to be 50 years ago. The lack of casinos and commercial development lets you focus …