Yep, I asked the same a couple of months ago (well how to fill a day anyway).
Do the Beast but maybe consider skipping the long non-singletrack loop (obvious on the map in the north-east corner). There’s a cafe half way round which is a life saver. Make sure you have a go on the the new Blue section as it’s a lot of fun and I think the Beast misses out Dream Time which is a lovely bit but can easily be got to from the Blue.
That will fill one day and cover everything the visitor centre side of the road. The next day you could do the trail the other side of the road or pick out the bits you enjoyed most on day one (or both actually).