Sailboat on Lake Kasumigaura in Tsuchiura. I went on a 50 minutes cruise around the lake and saw some of these up close.
My friends and I climbed Mt. Tsukuba early one morning (around 3am) and saw the sunrise. It was a wonderful and ridiculously tiring experience. I think we made it to the top around 6am, but we spent the remainder of the morning wandering around and back down Tsukuba-san. These people are precious to me.