Whatever the belief system or whoever they're dedicated to, shrines have a way of making you contemplative. Check out Hanazono-jinja and share a quiet moment with the locals.
This sacred place doesn't cost a thing to visit, which is wonderful news if you're watching your budget. Hanazono-jinja is located in Shinjuku Golden Gai. Once you've seen this place, Tokyo Sky Tree, Tokyo Tower and Tokyo Imperial Palace are in the area and also worth checking out.