All of the above,
Every member of the band should be so rehearsed that they could play the whole song without the rest of the band.
Arrive on time, I had one band that spent the first 2 hours phoning a missing band member that was actually playing a game of cricket that day but forgot to tell the band.
Bring everything you need (you would be suppressed how many times a band turns up and there is a piece of gear that has been left at home, at the last gig, etc)
don't take friends along, they make it into a party and distract the recording.
Don't take beer or drugs along, it's not cool and whatever you read in the mags, most big name acts don't take them along to the studio when they work.
Make sure your gear works, I have sent the first few hours repairing gear for bands many times.
New strings fitted the night before, not when you arrive at the studio.
New or good drum skins, tuned or close to tuned, no rattles or squeaks.
Bring good food and drink so less time is wasted when having a lunch break and eat before you arrive, I have had countless sessions that everyone arrives, sets up and then someone goes for a drive to get food cos they did not eat before coming due to running late, usually the person we need first. Everyone now sits around waiting.
And a couple of funny ones;
Know the name of the band, more than once I have asked the name of the band for file names only to be told, "We don't have a name yet we were going to call it blah blah but we are not sure" installs lot of confidence in the rest of the session.
Know the name of the songs, read comments above, however this name can change later if a better title come from the lyrics.
alan.
I checked out the studio's site, looks like a good setup.