We went to Boldt Castle directly and not through the Thousand Island Tours.This was also in the book "Off The Beaten Path" and really a true Gem. You originally go the Harbour and take a boat to Boldt Castle. The beautiful landscape on Boldt Castle is breathtaking and not overrated. On the Island there are so many beautiful gardens and featured to look at.In the castle you will see beautiful architecture and also a lot of empty space (you need to read the book) Take a look out as well at all the views from the Castle on the Water.
There are a lots of little islands with interesting houses. There's a restaurant at the pier where you can enjoy a breakfast while looking at the lake at the same time. Recommend to go during warm season.
We loved exploring the island. The castle is absolutely beautiful. Loved walking through the newly renovated rooms and hearing all about its history. It is a great place to spend an afternoon.