As others have said, park at the Greno car park and head over the road. The track goes into the woods a short way, then you will see the first of the “DH” tracks “Pub Run”. It isn’t steep, and everything is rollable.
When you get to the bottom, turn right and follow the fire road back to the top. From the top of pub run (facing down the hill), turn left to get to the other tracks “steel city” and “dh3”.
From the bottom of each track you can go either direction and follow fire roads back to the top. It’s not a big forest, and there are other things to explore.
For food, depends what you are after. Assuming you have come from the M1 j35a, along Stockbridge bypass, then if you get back onto that road and towards Manchester you will see signs for Fox Valley, there are several food options in there. Otherwise, from the Greno car park turn right into Grenoside and there’s a pub on the left.