Ooh I like Tokaido a lot! It has such a serene feeling to it. I have it's successor, Namiji, which is also a great game.

My favourite solo game is Spirit Island, it's a pretty complex cooperative game with lots of variability. You play as nature spirits (for example the Ocean, Earth, River, Lightning) trying to defend their island from the invading settlers. All the spirits are really different with their own unique powers. The rules aren't that complicated, but the decision space is huge. It plays really well at all player counts, and it's one of the few games where I think true solo (i.e. 1 spirit only, instead of playing the role of multiple players yourself) is a cool experience.