You could jump on the Canada line to Waterfront station (downtown, 20 min ride) walk 2 blocks to the Fairmont Pacific Rim (usually have some live music) and enjoy some sushi/rolls in their lounge OR across the street to Miku restaurant for sushi aburi (raw fish seared and with cedar smoke flavour, Mmmmm), then enjoy a stroll out on Canada Place pier or Convention centre and watch cargo ships being unloaded and great view of the port. A stroll back to Waterfront station and back on Canada Line to YVR to catch your flight.