Si The Si is a cafe at Umikaji Terrace on Senaga Island in Okinawa, where guests eat while watching the sea and planes at Naha Airport. It serves tacos, taco rice and drinks, with signature items including handmade gluten-free tacos made with red sweet potato, sugar-free apple banana smoothies, and Kibi Maru roast pork. From the terrace, guests can watch planes take off and land and look out over the sea, and booking through the official website or Google secures a sofa seat with a sea view. Outdoor seats in midsummer get strong sun and heat, making it hard to stay long.