Kyoto is a better option than Osaka for historical and cultural stuff. Osaka is pretty much only better for electronics shopping and host clubs. Kyoto is the old capital, so it’s got tons of historical stuff. I highly reccomend Fushimi Inari, a shrine area just south of Kyoto. You can take the subway there.

The best area for nightlife is the Roppongi disctrict of Tokyo. However, be very safety conscience there. While most of Japan is incredibly safe, drunk foriengers do get mugged alot in Roppongi.

I don’t know much about sumo.