Hilversum station is smaller than you might anticipate, it doesn't have as much choice in terms of services. There's the traditional Albert Heijn to go, and somewhat surprisingly (but not really if you know the area around Hilversum) a Starbucks. If your connecting through to Groningen or Leeuwarden and you want to grab a train snack it's probably better to transfer in Amersfoort.
If you want to rent an OV fiets, there's a shortcut into the underground bike parking - instead of going up the stairs/elevator to the main station hall go to the right around and under the stairs. There's a revolving door that leads directly to the bike parking and shop where you can rent an OV fiets. read more