All services in Japan are guaranteed 100% with no expectation of a tip. Diving is in the same form as any other service as the Japanese take it to the next level with small changing rooms, fresh water showers, hot green tea, and personalized dive master to take care of all of your needs. On Okinawa three dives will run you around $120 but that comes with the rental gear and a bento box (sushi) lunch. Just like I like full service gas stations once in a while, I like diving on a Japanese dive boat once in a while. Your gear is all loaded by the staff, and you are given a personalized dive brief in broken English. I have to laugh inside when I see a 90 lb Female Dive master trying load my steel 120 tanks. However, I always assist the Japanese Dive Masters as I divemaster for a second career. Everything gets simpler underwater for communicating as hand signals are the universal language. Japanese usually dive steel 100's but often they are not completely topped off so your dives are usually less than 40 minutes. They are always concerned about how much bar you have left in your tank. 300 bar is a full tank. Most Japanese tourist scuba divers are female and they have an extremely low SAC. So when they see a big American man; the Japanese divemaster immediately thinks you will be a air hog. The nice thing is that the Japanese divemasters give awesome tours as they have dove the sites every day and know where every annonome fish and Morey eel live. I find the service that the Japanese provide so enjoyable I have added it to my repotre' when I divemaster on American boats. I offer all of the Open Water divers to follow me on a tour underwater where I can keep an eye on them and assist them if needed. I also try to assist and provide 100% service just like the Japanese but keeping in mind that American's are independent and often like the liberty of exploring and venturing out by themselves.