Various tours available, I went on the standard tour last year and it's really good, a lot of non Arsenal supporters too, which was surprising.
Prices vary, but are from £8 concessions for under 16s up to £35 for adult Legends tours.
Here's some blurb from the site:
Emirates Stadium Tours
Follow in the footsteps of your Arsenal heroes by joining the Emirates Stadium Tour and taking a look behind the stunning Emirates Stadium.
On this amazing day out, you will have the opportunity to see all the areas which are crucial to the team on a matchday - from a walk down the players' tunnel to a seat in the first team dressing room. On standard tour, you will also visit the Directors Box and the Press Conference facilites.
Emirates Stadium has quickly established itself as one of the world's most stunning and spectacular sports stadia. Along with state-of-the-art facilities, the Club have incorporated stunning features from our Highbury history and personal touches from inspirational Arsenal manager, Arsène Wenger.
To book online now please visit our Stadium Tours e-booker
For further enquiries please click on the T&Cs or contact Online Supporters Centre
To download the Stadium Tours leaflet - Please click here
Phone: Arsenal Stadium Tours booking hotline +44 (0) 20 7619 5000