I like to think I am a well-traveled Texan, but until a couple of months ago, I had never been to the Houston Galleria. My previous trips to the Bayou City had revolved around exploring its renowned museums, sampling its globe-spanning cuisines, and soaking up the serenity of its manicured parks. So when I set out on my inaugural visit to the state’s largest mall (and the country’s seventh-largest) this spring, I fully expected to lose my way in its labyrinthine abundance: four shiny-floored levels comprising 2.4 million square feet of shops, offices, restaurants, hotels, an ice rink, and a rooftop tennis club.What I did not expect was that I’d get lost existentially. The Galleria has something for every taste and every budget, but as…