Nigel, Great to hear you are out enjoying that boat. There are some places that are dockable on the lake but there are not many that would give a quiet night if the winds shifted from uplake to downlake during the night. They are also meant for smaller boats. Our size will maybe fit 2 per side, but somebody is going to get some bounce.
There is fuel up at Stehekin. I know that is a question I raised earlier in the thread. It is non-ethanol and they are proud of it so be prepared. ( I believe I paid about $4.60 per gallon. ) And the Stehekin docks are included with the park or forest service docks at $5.00 per night, but you have to get them before you get onto the lake. They are available at the State Parks, and several places in town.
The predominant wind is down lake, meaning that it blows from the NW end (Stehekin) down the lake towards Manson and Chelan. When I was there it was an Upwind lake and the docks at Stehekin were very bouncy. (Meaning extra fenders and lines for sure.)
There are basically no anchorage areas between Manson and the north end and it is 40 miles, but there are park docks along the way, and there are pit toilets at each. There is essentially (actually) no radio service on the lake. The Lake Chelan Boat Company boats (there is typically one on the lake each day) do not respond on any of the typical channels -- 16, 13, 9, and there is no Vessel Traffic system. If there is a Forrest Service boat on the lake, they do monitor 16. Beginning sometime in 2020 there will be a new passenger ferry, a 40something catamaran, outboard powered, running daily from Stehekin down to Manson and back leaving Uplake in the morning and returning same day.
There are several launch sites, 2 State Parks, and a county park that has a multiple lane launch ramp. I overnighted at the Chelan State Park. Be advised that they have aluminum bull rails that are not particularly friendly to your dock lines so chafing gear of some kind is a good idea.
It is an extremely scenic lake and spectacularly clear water.
Go and enjoy.
Harvey
SleepyC :moon