Most clubhouses in Japan are on the extravagant side in a nod to the 80s bubble economy, which saw the popularity of golf explode across the country - and with it extortionate membership fees.
When you arrive at the clubhouse there will always be a few staff ready to take your bags and give you a warm welcome. Make sure to take what you need from your golf bag, as it will be whisked off to your designated cart almost straight away.
When you enter the clubhouse, head straight for the reception where you will be asked to fill in a registration form. There will be lots of questions in Japanese here, but really all they need is your name (in block letters), your email and your telephone number. It's always good to leave your address in Japan or hotel name, too.
Once you have completed the form they will give you a locker wallet containing a key for your locker and a scorecard. This locker wallet is very important as most clubs operate a locker number system whereby you use your locker number for purchases in the pro shop, restaurant etc., and then settle your bill just before leaving on check-out at the reception.
When you get to the locker room, it may be necessary to remove your shoes. If this is the case take them with you to your locker. For valuables, there are small safety boxes in or close to the locker room. Once you have left your belongings in the locker/safe, you are good to head out to the practice facilities if time, or to your cart and out to the course.
A note about dress codes for playing golf in Japan
In most public golf courses in Japan, they are not as strict about dress codes as on private courses, but it is always good to be dressed smart/casual in something like a collared shirt and trousers (not denim). With the hot summers in Japan, most courses are OK with shorts and a polo shirt. If you are in doubt about it, it's best to ask the course (or whoever booked the game for you) before you go.
Covid 19* Update: Remember that in Japan despite relaxing Corona-19 protocols, the course will expect you to wear a mask while inside the clubhouse, only while eating at the restaurant or bathing in the locker room is it acceptable to remove your mask. If you are being picked up at the train station by the course employees also please remember to wear a mask.