Don heads to zMAX Dragway, the world's only four-lane all concrete drag strip, where he gets to ride in a two-person dragster at around 160mph. Next, Don visits UPS Worldport in Louisville KY, where he unloads an incoming aircraft and sorts packages. Then, he heads to Washington DC where the Lincoln Memorial Reflecting Pool's water supply system is being updated to eliminate stagnant water by circulating water from the Tidal Basin. Here, Don carefully places one of the original stone slabs back along the edge of the pool. Then, in Wilson NC, Don travels to a local restaurant for a grease pick up. He places the collection truck's hose in a bucket of grease and and then dumps the grease into a processor back at the facility. He checks out the grease step by step as it is refined into biodiesel. And in Denver CO, Don ducks underground to a construction site where a 22-bay bus station is being built as part of the Denver Union Station redevelopment project. And finally, Don heads to Hawaiian Falls Waterpark in Roanoke, TX to see how crews gear up for the impending summer season. Here he climbs up a rope about 8-stories to wax and buff a section of the "