First of all, Here’s a long-distance “Happy Birthday” to you from Europe. Are you in Tokyo now? If yes, How about Tokyo tower? There is Birthday pack. Please find the details here. https://www.tokyotower.co.jp/other/birthdaypack/en.html If you are close to Yokohama, why not Hakkeijima sea paradise? http://www.seaparadise.co.jp/english/ You print out below page (only Japanese) and bring there, You get reduction and you can get some discount voucher for shops and restaurants. http://www.seaparadise.co.jp/coupon/birthday_regular.html Have a wonderful day!!