The situation is absolutely beautiful, but due to the limitations of the weather we spent our time ducking out of the wind, putting change into the vending machines for hot drinks and ice cream (no logic at all) and shopping. A retreat from the big cities for millions of Japanese Lake Ashi is a dedicated national park and conservation area. There are plenty of boats, both large and small to rent. Many of the larger boats/ships sell all day tours with lunch. The lake is large enough that high winds can easily cause dangerous conditions; so we missed our chance for a nice afternoon on the water.
There are many family sorts of activites that are popular on fine days including swan boats for children, small amusement parks, child oriented museums and vast numbers of places to buy holiday food items. Popcorn, candies, ice creams, cakes and sweet drinks. We really liked the ice creams in the vending machines and even tried to 'vendo' hot french fries. They were good!
The roads were good (drive on the left) and the traffic not so bad, but it was foul weather. Very crowded during fine weather in July and August.