I have been there many times, but I got access from working there and I have never been on an official tour, so it probably doesn't help if I answer the questions literally.
There are different types of tours, they typically have surface facilities only. CERN Control Center or ATLAS Control Center, the Magnet Test Facility, the Globe, the Microcosm exhibition or something like that.
In 2019 and 2020 we have a long shutdown so some tours can include underground visits, but they will have limited slots and they will be very popular. Check the CERN website for more information and be quick with registration if they offer a tour that includes a detector underground.
seazal said:
There are many hotels in Geneva but they tend to be expensive. If you don't mind a bus trip (or if you have a car anyway) you can stay somewhere on the French side, things tend to be much cheaper there. Or plan the trip to not stay there over night, if possible.I don't know your overall travel plans, but if you are flexible: There are many research institutes that offer tours, some of them have more things you can see.
DESY (Hamburg, Germany) had the HERA accelerator which is shut down now, that means all their tours go there. You can see parts of the Hera-B experiment (partially decommissioned, but most of it is still there), you can go into the actual accelerator tunnel and see the accelerator (something you normally cannot do at the LHC, even during a shutdown), you can see an experiment hall for the PETRA facility while it is running (the actual accelerator ring is behind a lot of concrete shielding, however).
GSI (Darmstadt, Germany) has tours that include various experimental stations and a view at the FAIR construction site.
PSI (middle of nowhere, northern Switzerland) has tours, I don't know what exactly they include ("takes you around the large research facilities or the energy research labs" according to the website).
And so on.