STRONGLY DISAGREE! If you are a race fan, and if you can afford it, and if their schedule lines up with yours, riding in the IndyCar two-seater is definitely a peak experience you will never forget. Here’s what I wrote about it five years ago:
The main problem may be scheduling. Looking at the site, it looks like most dates in July for the oval are sold out, although there were some slots for the road course.
But if you can’t, or don’t want to, do a driving experience, I agree that the museum and tour are interesting, although I’m a long-time open-wheel fan, and not a NASCAR fan.
The Indiana State Museum is not far from downtown, IIRC, and has an IMAX theater and a lot of exhibits about the history and natural history of the state. If you’re interested in those subjects it might be worth a visit. I don’t remember any real “wow!” moments from my visit, but take a look at the website; I might be doing them an injustice.