This former mill town is coming into its own.A scenic view of the river going through Winooski.Credit: Vermont TourismWinooski, VermontSugar House Hotel is Winooski’s first-ever hotel and Marriott’s first all-electric, net-zero carbon property, opening this fall.The Winooski Riverwalk traces the falls and old mill district on a free, well-maintained path that’s open year-round.Misery Loves Co., a former food truck turned rotary staple, has earne…