WayneO- First, welcome to LSCN. This is always a great question to answer. As far as Muscamoot Bay, during the week is really tame in there. Like most other big boats that draft 2-3'. Heading approximately 40degrees N NE into the bay from the closest point of the south channel lights (old south channel). To be safe stop about 1.5 miles into the bay from the rear light position. You should still have a decent amount of depth (4-6'). Even during the week, if it is warm enough you can usually find other boats in the bay anchored. Giving you a reference of where others anchor and find some good swimming.
Here is a rough guide to the entrance I just described. The area marked in yellow is the typical swimming area that has a decent sandy bottom. And also where the party is on the weekends.
Goose Bay is an awesome bay to chill out in. On the weekends it can gather quite few boats. Mainly families and smaller groups of party-ers, but nothing like Muscamoot. A definite must do on your list of places to visit. The entrance to Goose is similar to Muscamoot. You have to be careful of the middle channel. On a clear day the markers are very clear to see, but can be tricky if you are not used to it. If you have a chart plotter you can make it no problem. Here is a chart with an idea on how to get in there. Once again.....plenty of depth if you follow your gauge. The two X's are the typical spots for anchoring.
Now if you want (almost) complete peace and beauty, then the Sni Bora(Chenal A Bout Rond) is exactly what you want. I say almost because you do get an occasional boat that comes by to remind you what planet you are on. The Sni to me is the most beautiful part of the lake. With so many spots to choose from where you can tuck your bow into a shallow spot and still have your stern in very deep water for some deep water swimming. Dealing with a slight current (but managable) cool, clear water and so much nature to watch and listen to. Be aware that the Sni is "no wake" for all boats 26' and over. And a 3/4 mile strip on completely no wake for all vessels down behind Strawberry island. That is where I like to tuck in and anchor because of the lack in boat traffic. It is just an area that you need to explore and see for yourself. The following chart is the Sni and the markings in Red (including the Baltimore hy)are the no wake for all vessels. The way in there is up the North Channel then south into the Sni. It will take some time to get there, but well worth it.
If you have any other questions to the information I posted, feel free to ask.