If you're hoping to ride on more than one day of your holiday you might want to consider buying/downloading/printing off the local OS map.
The Sherwood Pines trail isn't massive so if you want entertainment on more than one occasion you could explore some of the local bridleways too. It's all really nice woodland riding around there, there are tons of trails, and there are a few lake/country park things which add a bit of interest as you ride. Your rigid Inbred will be fine for anything you might find around there.
This website has loads of Sherwood routes as the guy that runs it lives in Notts so he and all his mates (inc me!) use it a lot. http://www.justgoride.co.uk/