A very pretty hike. It starts off somewhat tough right away but actually eases out the closer you get to the peak. If you're not used to hiking then it will be a good workout but even fitter people will find a challenge to it. Currently (Feb. 2017) there's a few downed trees with a couple that aren't easy to climb over/under and will force you to probably have to leave the trail temporarily. There's probably great views along the way but, unfortunately, a cloud was directly on top of the mountain when I went so I saw nothing but mist.
In order to reach the trailhead from your car, you'll need to follow signs for Mt. Lake. There's a small parking lot (room enough for about 6 cars) along the lake. To the left of the shelter with the cooking stove is a trail to Little Summit. Follow the trail for 1 mile until you reach the crossroads where you can continue the 0.2 miles to Little Summit (might as well!) or veer right for another 2 miles to the top of Mt. Constitution. On the way back, you can opt to either return the way you came or cross the parking lot and road and take the trail leading to Twin Lakes. Further sites along the route involve the Twin Lakes and Cascade Falls. From September to May, be cautious of mountain bikers!
Cloudy, cool day. We had done Mt Lake loop several times before so wanted something new and added the Twin Lakes extension including the loops around both. Parked at the second small lot closer to the Twin Lakes end of Mt Lake. So many great views of each of the three lakes. Just above the larger Twin Lake encountered the private property of the YMCA which also should be accessible via Raccoon Point road and it's connecting roads. We respected the private property and turned back. Overall the trails were very well maintained with excellent signage. Encountered a number of other hikers around Mt Lake but only few on the trail to and around Twin Lakes. Although rated moderate difficulty, I would rate it easy and recommend for anyone preferring a beautiful hike away from crowds.
We combined this hike with the add on loop to cascade falls. Very nice views and changing terrain. Steep in sections and the stated elevation gain is misleading as the ups and downs are near constant. We started and ended at day use beach, great views of lake all around the loop.