The next lake up the boarder from Sandpoint lake is Namakan lake. It has some really fun Deep Water Soloing. The coolest wall is right when you get to Namakan after going through the channel between Sandpoint and Namakan.
There are more problems on the many islands on the east central side of the lake. There are also a few interesting looking problems on Sandpoint lake.
Boat from Crane Lake to Sandpoint Lake. Keep going all the way north to the channel to Namakan lake.