Imagine all the amenities of a charter cruise: days of scuba diving and nights of wine-paired dinners overlooking a sunset, crystal stemware and marble bars. Now, imagine this experience for just your family or a few close friends. Lake Travis’  river-rock bottom means clear waters, quiet coves, and dozens of waterfront restaurants with dock access—an environment that seems custom-made for luxurious vacations on yacht-style houseboats. When event planning begins with …