A few warnings about the Arclight Cinerama Dome.
You can buy the seats you sit in at the Dome theatre. If I were you, I'd try to get in the back half of the theatre. Or if you can only get in the first front half. Try to get tickets in the furthest back row of THAT front half. I saw "The Two Towers" at the Dome and I sat three quarters of the way back in the first half section and it was WAY too close. I couldn't see anything clearly. And with PJ's style of being close in on action with shakey camera, you're going to hate watching some of the fights there.
Best seats are in the first 3rd of the back half of the theatre. IMHO.
I hear another kick arse theatre is "National Amusements The Bridge:cinema de lux". That's actually kind of close to the airport. There's another theatre at a place called "The Grove" that is also awesome. Never been there, but I hear its got high quality system plus like balcony seats with little tables for food & drink. Neat-O eh?
I personally think the sound in Chinese Theatre is slightly better than Arclight, but I could be wrong. I saw "HEAT" there and it was just awesome. Saw the "Star Wars: Special Editions" there too. Stupid thing about the Chinese Theatre is whoever is in charge of what gets shown on the main screen there. The theatre manager or whomever... is a total fool. They always seem to be NOT showing the movie that should be showing there.
When "Starship Troopers" came out, they showed "Mr. Bean" on the big screen. They do this all the time. I don't really know why. Most likely, "Mona Lisa Smile" is showing on the big screen instead of "LotR:RotK".
From Thousand Oaks, getting to Hollywood (to the Arclight) is about an hour depending on traffic. You see, if you go during night on weekends, the surface streets by the Arclight are super crowded. It will literally add an extra half hour to your total drive going from the Highland exit of the 101 freeway to the Arclight. I'm sure your relatives will know how early to leave and all that.
But THE BEST theatre in Los Angeles (for me so far) is the Kim Novak Theatre on the Sony Columbia/Tristar lot in Culver City. But unfortunately you can't get in there unless you are an employee and they also happen to be showing that movie that week. I hear "The Bridge" has a theatre that is suppose to be on par with the Kim Novak special screening theatre. Big leather seats, awesome sounds, etc. Since that theatre is new, I haven't been to it yet. I'm going to try to see RotK there Saturday. To see for myself.