On Wednesday definitely take advantage of free access and viewing of practice sessions from the Pit Terrace areas - right above the pits on the main straight. The sounds alone are worth the effort. They're restricted for reserve seating after that. Take part of one day and wander the track over in the Green Park and North Paddock, many good places to watch and take pics. Night practice is Thursday night at 7:30 I think; great stuff! The schedule is posted now at
www.americanlemans.com in the Paddock Pass. Qualifying is Friday for ALMS. Get there early on raceday as viewing mounds populate fairly early. Morning warmup is at 7:30, race starts at 10:30.
Have fun, and post back on your experience.