Where have you ridden when you’ve been over before? – I’m only asking as there’s not much point in telling you about stuff you already know.
Basically you’ll find something good in pretty much any plantation that you go to, especially (in no particular order) Arrasey, Cringle, Ballure, Sky Hill, Ballaugh, Tholt-y-Will.
Plus all the open hill stuff, cheeky and non-cheeky…….
Another thing is to have a look at the Manx Mountain Bike Club and Loaghtan Loaded Facebook pages to see what social rides are on while you’re over, plus feel free to email me (in profile) and I’ll give you some more detailed info or, if you don’t mind being seen with an old biffer, I’ll happily come out and show you some of my local stuff.