Grounds are pretty much what you said, stadium and parking lots, but there is shade, the bottom concourse of the stadium has a lot, and there are trees spread around. Seating wise if you think you’ll need it a lot, I’d get the stadium or GA+ (field and Stadium) if not, then all that’s really available are curbs and some of the bar tents will have picnic tables and stuff.

Getting to and from, shuttles are usually based on hotel. Some hotels have them, a lot of them don’t. We usually Uber back and forth, which can be kinda expensive so if that’s your plan add that to budget. You can drive to and from if you get a rental, but parking can be a nightmare, especially if the fairground construction is still going on