^ Could go either way. Mon/Tues are typically "low" attendance days, but august is august. Those are certainly the best days of the week to assume lower attendance. BGW is weird though. Sometimes you go on a weekend and can walk right onto coasters. Sometimes you go on a weekday and are waiting an hour.
With that said, outside of Hallowscream and major holidays, wait times are rarely more than an hour for any ride, and you're far more likely than not to see wait times of 5-15 on most coasters, with Tempesto being the only one to have a somewhat longer line (though still usually short). On a hot day, the water rides are the longest lines in the park by a longshot, and the skyride can also have pretty long lines, especially towards the end of the night when people don't want to walk anymore.
I'd recommend you go hit up Tempesto first thing when you arrive. Loch Ness tends to have it's longest line at the start of the day and taper out to near nothing later on, save the busiest days. Verbolten often has the longest looking line, but moves very quick due to duel loading. If you start at Tempesto, you're also primed for Apollo right there, you can hit up the festa/Italy flat rides, then follow the circle hitting Verbolten, DarKastle, more flat rides, then through to Alpengeist, Invadr, Griffon, then back to the park enterance for LNM. Make sure to ride LNM and Griffon in the back if nowhere else, the airtime is insane. Apollo is also spectacular in the back. If you have time for both a front and back ride on Tempesto, they offer different experiences. Alpengeist is good in every seat, still one of my top 10 roller coasters of all time, and my personal favorite in the park. Make sure to brace yourself before going through the cobra roll and MCBR on Alpengeist, it's from the era when B&Ms still had balls and throws you around a bit. Rest of the ride is super smooth. LNM is a very non-arrow Arrow, so it's a very smooth ride by Arrow standards.
DarKastle is really fun for what it is, so don't miss out unless simulators make you sick. They have a lot of oldschool carnival flats that are really worth a spin as well. Mach Tower is the worst drop tower I've ever been on, when it's even open, so if the line is too long don't bother (though the view is really cool).
Also, the show in Ireland is really cool if you're even remotely into step dancing. Trappers smokehouse is awesome to eat, but the quality tends to differ throughout the day. At major meal times when there's a line, it's the best food in the park. At shoulder times, it can be lackluster. The food at Das Festhaus is really freaking good too though, especially if you like German food. Italy has a newish marketplace with a lot of variety. I haven't had a bad thing from them yet, though I haven't lived in VA for years now.