It's not terribly busy only busy on the 3 day weekend, otherwise it's quite calm during the week since most kids are in school.
I would get signed up for the race first and then look at the packages if you want to stay onsite. There may be specials offer for rooms then as well. We should hear about deals in late July.
We may only be there for the three day weekend. Are we talking summer crowded or Christmas crowded? We were there for 4 days in October and thought it was pretty busy.