Hondarribia is a small and quiet alternative to San Sebastian. It's also the town closest to the San Sebastian airport. There are some excellent restaurants and bars, including Bar Gran Sol. This year, we took a taxi to/from San Sebastian but next year, we're going to take the E21 bus. Google maps is very useful as a first-start to trip-planning. It often gives bus and train options. That's how I found the E21 bus and the website of its operator, Lurraldebus. There are several buses that run from San Se to Hondarribia but the E21 makes the fewest stops.