Got hung up in walk-in care last night but here goes.
Tho I dont do the houseboat thing, I have camped/fished Namakan for the last 19 years. Instead of Blind Indian I would go a bit further and look at Wigwam Point or the bay just north of the Torrey Fish Camp campsite (unofficial site but an awesome beach). Junction Bay also has a nice beach, with western exposure.
If you decide to head up towards Kettle Falls to visit the “Tiltin Hilton” the Mica Bay site has a decent beach. Voyaguers Narrows has a small sand landing that is protected, but the beach area is on the main channel side and gets busy with boat traffic. If you go up to Kettle Falls, houseboats are not allowed to dock at the main docks near the dam. They have separate docks on the left side of the peninsula, and a short trail that leads to the hotel/bar. You can also go to the overlook at the dam. They do have golf carts if anyone in your party needs assistance getting around, and they monitor channel 12 on the marine band.
Going east, the official McManus site is on the west side of the island, but on the east side of it is a beautiful big beach with very protected waters. Very popular. Not an official site but in 20 years I cant remember a houseboat not being there. Just east of there is Randolph bay, decent beach but faces NE so you loose the afternoon sun earlier. Once you get down to the Pike island area you have the three sites Stan mentioned, all very nice sites.
There were two sites close to our campsite last week, Mitchell Bay and Mitchell island. Both had sand landing, small beaches but pretty protected. Those sites are 15.5 miles from the Ash River Visitor Center boat landing, making it about 19.5 from Ebels docks for reference.
Surface water temps on Nam last week were between 70 to 73 on the main lake. I did go swimming (we had a shallow sand beach that was perfect tho) and saw limited tubers/skiers.
Hope this helps some. If you want to exchange cell #’s before going up message me. I have ATT and get service going east just past Fox island so will have it at our campsite. We’ll be setting up camp around 11 on the 23rd.