I stay offsite for most races and it's very easy, as long as you have a car. (Taxi/Uber might be easy, too, but I don't know anything about that, personally.) Just be sure to leave early, before roads close and traffic backs up.
I just want to strongly caution against leaving anything of value in your gEar check bag - they DO sometimes get lost. A friend fo mine left his car key in his bag one race and the bag was lost; he was stuck with his car sitting in the EP lot and no way of starting it to leave. I always keep my car key, ID and a little cash on me during races. If I check a bag, I only put things in there that won't be a big deal if lost: change of shirt, flip flops, etc.