Windsor Castle Park/Smithfield Hike 5 to 6 Miles

We'll meet in the parking lot beside the Manor House in Windsor Castle Park (https://www.historicisleofwight.com/windsor-castle.html) at 301 Jericho Road, Smithfield, VA 23430 to hike a 3.4 mile loop that has a slightly hilly forested portion as well as flat open areas. I would like to cover 5 to 6 miles in our two hours so we may walk some more in the park or we way weave our way along Main Street and down the residential side streets that intersect Main.