So many places, so little time. It’s the big conundrum of travel: if you spend too much time in one place, what will you miss that’s just around the bend? As John likes to say, the sand is slipping through the hourglass. Even so, we didn’t get to spend nearly enough time in the Peru’s Sacred Valley. We were in Cusco for four days to acclimate to the altitude before our Inca Trail/Machu Picchu adventure, and then stayed in Ollantaytambo for three days afterward. Now, the Sacred Valley has joined the long list of places to which we hope to return. Maybe . . .So what’s so sacred about the Sacred Valley? For starters, it’s the cradle of civilization for the fabled and long-disappeared Inca empire. It’s also known as the Urubamba Valley, since it traces the Urubamba River for 60 miles all the way to Machu Picchu. Although MP is…