The most challenging VFR arrival at Boeing Field (KBFI) is the Vashon Arrival, used for aircraft approaching from the west when runways 32L and 32R are in use. You must descend below two Class B shelves and then fly a tight left downwind at 700 ft over the Duwamish River. On this MVFR day, Boeing Tower sequenced me between two 737 arrivals; just another day at KBFI.