The courses that we use at Checkendon are very similar the the Rampage Races and the kids course at other rounds, including Wasing are always laid out with as little climbing as possible and we try to make them fairly short with single track so it’s not a case of the bigger kids just riding away. The shorter course for all U12’s is done to encourage them to ride the course as many times as possible so that they get the practise the more technical stuff and realise that mountain bike isn’t just about pedalling.
There is usually a great group of childeren playing around the arena while their Dads race but like you say it’s probably a good idea to have your wife their for the first one so that your lad can make some friends and get to find out who the other parents are who tend to watch over them.
For the Adults the course at Wasing is a little more technical than Checkendon and unsurprisingly more hilly but it still has some good woodland singletrack and all of the technical features have Alternative lines so you have a choice to ride them or not. Also if it interests you it will be almost exactly the same course as used for the 2nd round of the National Points Series round 2