Focussed on Downhill fun?! The down hills are good, but that gives the wrong impression.
Most of the distance and time will be covered climbing fire-roads. Take tyres that give you a bias for good rolling. Your legs will thank you after the halfway mark Worth a little compromise on the downs IMO. Unless you're in a competitive position, most of the rocky descents will have a film of mud on them by the time you get there – not many tyres will help you with that anyway. I did it on Small block 8's. Crossmarks would be good too I reckon
Its a nice event of its type with a good vibe.