Is there a documented (Guinness or otherwise) world record for most theme park rides taken in one day by one person, using a normal, public opening day and advantages anyone could normally buy? (This means that an "unlimited line skip" pass would be allowable if the park offers one). I'm interested in either total count or different rides, although a "total count" record should include a mixture of rides, not using one ride all day.

As far as I can see, there is no Guinness World Record for the most theme park rides ridden in one day. There is a record for the most roller coasters ridden in one day (74), but this involved using a helicopter to reach the different roller coasters, which is definitely not a normal advantage!

https://www.guinnessworldrecords.com/world-records/most-roller-coasters-ridden-in-24-hours

However, there is a case of two men, Shane Lindsay and Ted Tamburo, managing to ride all 46 rides at Disney World in 2014 within 17 hours. This was repeated in 2019 by Shane Lindsay and Kristina Hawkins, who spent 18 hours visiting all 46 rides without using FastPasses or any other advantages.

https://www.nydailynews.com/2014/11/17/two-men-take-on-all-46-rides-at-disney-world-in-one-day/

https://www.dailymail.co.uk/news/article-6970265/Couple-manage-ride-46-Walt-Disney-attractions-one-day-without-using-FastPass.html