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Second! Visiting is very interesting, and the tour guides are real scientists that actually work there. I was lucky that they were able to fit me in same-day even though I hadn't booked ahead as strongly recommended.

A lot in advance :) I booked more than a month before because there are 10/20 places available per day.. I visited by myself the Globe (where Tim Berners Lee machine is located) and the microcosm exhibitions by myself, and the guided tour covered and introduction, the LHC control room and the first accelerator (synchrocyclotron)

Thanks. I got to visit as a student, in 2008/2009 I believe, and it was a great time. Seeing ATLAS and many other experiments.