It's an easy walk too. I'd allow yourself 10-15 minutes if you're in decent shape. I didn't bother with the shuttle.

Also: there is a shopping center down the street (away from the airport) that has a nice little inexpensive cafeteria restaurant thingie (food cooked to order though). Worth checking out, I had a couple of meals there. The supermarket also has salads, sandwiches, pizza, etc. in case you want something quick and cheap that night.