App leads couples on romantic S.F. walk APPS Interactive walking tour of S.F. leads couples to romantic sites Stray Boots, a company that makes an iPhone interactive walking-tour application, has released The Perfect San Francisco Date in time for Valentine's Day. The app takes users on a scavenger hunt through the city, stopping at romantic sites where couples gather clues, answer trivia questions and get to know each other better. Grace Cathedral, Cozy Cable Car Cafe and the Top of the Mark are a few of the 15 featured destinations on the Perfect Date tour, which generally takes two to three hours - longer with dining and shopping stops - and is no more than 1.5 miles. The Stray Boots application is free, but each tour - besides the Perfect Date, there are four other walks through various neighborhoods in San Francisco - costs $2.50 to $12 a person. Millman, 29, got the inspiration for creating interactive tours during a vacation in Rome with his parents and sister, Noemi Millman, also a company co-founder who runs the tech side of the business. "At first we envisioned it as being perfect for the 25-year-old backpacker," Millman said, adding that he didn't think locals would enjoy visiting sites in their own cities, like tourists. On Valentine's Day only, San Franciscans can use the app to send their loved ones a dozen roses from Whole Foods, a goody bag filled with Bay Area treats and a serenade from one of six local musical acts for $150. The iOS encrypted video and text-messaging application helps users declare their undying love without going viral. Because all content is only viewable from app to app, unlike other video sharing apps, the company says this one can't be accessed on a website.