I've done it.
I really enjoyed it. The course is flat...almost completely. Great atmosphere ,as night falls about 10 minutes after the Start . No medal ..but nice ,bright long-sleeved T-shirts distributed before race meant that we looked good in the dark. We stayed here and the Start was outside the hotel door. * A bit of a walk to the nearest Metro, this is not in the heart of town but right opposite the beach and taxis are cheap. N.B. It's, clearly, a 'clothing optional' beach and a surprising number of very mature Catalans swim all year round. * Water station and chip-mat at 5k and the Results were on the official site very quickly. Not a lot of crowd support until about half way but lots of cars honking their horns.Definitely a fun way to start off New Year. Anything in particular you want to know?
Every restaurant was packed by 11pm ...since the New Year is welcomed by huge amounts of eating and drinking ....and clubs etc seemed to run from about 1 am 'til...who knows? Loads of fireworks at midnight.