For mayo lovers of all ages, head to a free factory tour at Kewpie Mayo Terrace and discover what makes Kewpie mayo tick. What to expect Get shown around the "factory" (more like a museum) and eat potato salad made from Kewpie mayonnaise, spot the hidden Kewpie mascots, and just have a great time. At the end of the tour, you'll receive a free souvenir out of several options -- we recommend choosing one that includes a miniature Kewpie doll. There's also a small gift store where you can buy Kewpie food products and themed-goods. Entry You need to reserve a spot on a tour to get inside Mayo Terrace, luckily these tours are free and often have an English-language option on the day. There are usually three a day from Monday to Friday, but this can vary, so make sure to check the official website. The tour is extremely popular and reservations open one month in advance, so book early to get a place. How to get there The factory is around a 5-minute walk from Sengawa Station on the Keio Line, around 20 minutes from Shinjuku Station.