I managed to visit last week after years of wanting to go and it did not disappoint.
We were very lucky and had a C130, 2 Ospreys and a couple of F15s all in about a 5hr window.
Big kid moment
We parked at Cad West, there is a big layby for 20ish cars and about a 15min walk up the hill.
https://machloop.co.uk/ This has plenty of good info on access and locations.
In terms of spotting aircraft, it is pretty random. They only use the loop Mon-Fri and the MOD low flying schedule has no resemblance to what actually happens. It is very much a case of take some snacks, a flask and go and sit and wait.
Clear weather will increase your chances, as will bad weather in the Lakes or Scotland.
You can also use 360Radar or https://globe.adsbexchange.com/ to track what is about. Just hit the military filter to get rid of all the commercial stuff.
I think the Hawks and Texans from RAF Valley are probably the most common. The F15s and F35s will come from Norfolk, so you can keep an eye on that area with the tracker.
Hope that helps and you get to visit
Yes, this has the easiest parking and access. Can get very crowded though if any "rare and exotic summer visitors" are forecast.
Something to keep in mind is that the proper name for"Cad East" and "Cad West" is Bwlch Llyn Bach, - The Pass of the Little Pool, also known locally as Bwlch Talyllyn.
My inner kid wants to go, and my po-faced grown-up tells me not to be childish. I'll probably go.
(Ps, I sent you a dm about Wern Cyfrdwy a few weeks back - perhaps you didn't see it.)
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