Despite the traffic, Timp really is a must do hike. However, if a plan B mountain is needed I'm partial to Box Elder. It sees far fewer people but provides fantastic views of the Wasatch. I prefer the approach from Dry Canyon, but the route from American Fork Canyon is shorter. With a decently fit group and good forecast, this is a Wasatch 11k pk you could start late if your group refuses to get out of bed. I must now go and beg forgivness from Mother Timpanogos for even suggesting another peak. Have fun.