I had my breakfast in Japan this morning! I visited The Koto Project, a well designed Japanese Roleplay sim, situated in the Edo Period.
Although for roleplay, and they do have rules (read them, a notecard is provided upon arrival), visitors are welcome and as far as I could find in the rules there is no need to dress to theme when just passing by. The notecard, by the way, also has some great tips and tricks on roleplaying, which is nice for newcomers!

The roleplay is ‘community’ RP, so people rent homes in this town, houses which you are requested not to enter. You do not need to perv in peoples homes to enjoy this place, there is enough else to see and if you take the time to walk around you will find lovely details and beautiful buildings and a street with some shops too!