I went last year using their package. Yes , you can go everywhere. It is nice having a warm, dry place to go as it rained last year. I had already purchased tickets for the race when the Cadillac offer came out, so I am not sure if Pit Passes are included, and they are a "must". You can buy them right there, however. I just bought the Cadillac Corral package last week, so I am in.
We went in the main entrance at the start/finish line. Up an elevator to a skybox/suite area. Great overall views of the entire track and the pits, too. The suite is easy to find, there is plenty of room as well. We had gone down to the grassy infield by literally walking across the track (man, the slope of the track is quite something as you walk it). You can see the cars up close and personal, then we went back to the suite for the start. We sat outside in the private seats to watch the start. Oh, yeah, we might have had a beer or two.
You can sit anywhere you want throughout the entire track, private suites excluded of course. After eating something we took a trolley to the vendors area and checked it all out. Then we parked our butts along the horseshoe for a while. It's a lot of fun.
I've gone to the Rolex 20 times or more. Always a great time (except for 2003 or 2004, I think it was, when it rained so hard they red flagged the race). I drove home and watched it on TV when it restarted. Looking forward to this year!
I'm assuming the corral is in the infield section?