Tour was okay, tournament is once in a lifetime experience!
The tour was fine but I would have liked to learn more about sumo itself. The guide was friendly and jovial, but again some context with the tournament and its rules would have helped as well as details about the significance of the rituals in Japanese culture. We were very happy with the price and the tickets we received.
Useful explanations before entering the arena
Had Ken as a guide. He gave a helpful overview of sumo (some history, interesting facts, rules, etc) as well as what to expect inside the venue (interior layout, where to buy chankonabe, etc). We then went into the venue at around 2:40pm. The makuuchi (senior division) entrance wasn't until 3:40pm, so there was more than enough time to explore the arena--no need to be in a hurry!