The mountain scenery is incredible. Tour boats travel to Spirit Island (but no further down the lake) daily.
The most beautiful area, to my mind, is the southern third of the lake, with Mt. Paul dominating along with Monkhead at the south end. Fisherman's Bay, at the narrows provides camping as well as Coronet Creek at the far south end of the lake. There are limited sites available at each (8) and reservations must be made in advance. You will be limited to a two night stay.
The lake is very cold, and winds can be unpredictable. Best advice to begin your paddle early in the morning. On our latest trip, we left the dock at 6:30am with temperatures at 3C.
The paddle down to Coronet Creek(kayak recommended) takes anywhere from 3.5 to 5 hours or more depending on conditions.
This should be on the bucket list of anyone who enjoys paddling great mountain lakes.