A few gentle spins between now and then to keep the legs turning over and to allow full recovery would be ideal.
Eating-wise, good, healthy food, plenty of carbs and try to hydrate really well (it’s due to be fairly warm on Saturday). Night before really depends on you – some people benefit from eating loads, for others that just makes them lethargic the next day.
Strategy really depends how serious/fit you are. If you’re really going for a result then sprint to the first singletrack and then settle into a steady pace, ideally that feels a bit easy so that you can sustain or even raise it later. If you’re less serious, then just go with the flow as time lost there will be small in comparison to how much the fast people will beat you by anyway.
During the race, drink lots (basically as much as you can manage) and try and eat plenty too – what will really depend on you again. Some get on with gels, others don’t. Try and also pack some normal food for if/when you get sick of race food – eg ham sandwiches, etc.
See you there!