Unfortunately, ART (Anaheim Regional/Resort Transit) seems to have discontinued any and all service to Buena Park. Back in 2022 amd 2023 I used ART a lot to get to/from Buena Park, where the three stops I recall were Knott's Berry Farm in front of the employment center (near the entrance), Beach in front of the former Movieland Wax Museum (across from Medieval Times), and on the street in front of Fairfield Inn on Orangethorpe.
There was no specific route to/from Buena Park back when I rode - only on-demand rides. And on-demand services may have been limited around peak
Disneyland times (early morning and maybe 8 PM to close).
Metro 460 is OK, but it doesn't have frequent service (maybe every 40 minutes). The TAP fare card ($2 just for a physical card) is useful for pretty much every public transit agency in Los Angeles County, but you can get a virtual TAP card on certain mobile devices for free. And using a TAP card is the only means to get a day pass, which is now automatic through a daily fare cap. However, I think they always accept cash fares on the 460 bus. The other thing is that you can get real time info on bus location with either the TAP app or some navigation tools. I was able to get real time bus info from Apple Maps if I entered the destination. I would show me where the bus was at least every minute or so. I was very accurate and I could often wait and get to the bus stop maybe a couple of minutes before the bus arrived.
https://www.metro.net/wp-content/uploads/2022/02/460_TT_02-20-22.pdf
https://octa.net/ebusbook/RoutePDF/MetroBusSchedules.pdf?n=202308
Orange County Transit Authority doesn't really have any good options for that route. But they do provide info on Metro route 460. This is just the first page of the previous link:
I've taken route 460 many times, including all the way to Los Angeles. I've seen a few things I can't unsee, but it wasn't so bad just between Anaheim and Buena Park.