As others have said, Woodlands is indeed a good day out and, if the weather is good, then there is a lot here to keep you/the kids entertained all day. Admission prices to these kind of places always seem steep to me, but in reality and taking in all there is on site, the admission is very reasonable.
I would agree with @peteburden that the food is pretty grim. The kind of fast food that you get at a fun fair or similar, so there are no surprises. But there are areas to eat a picnic if you want to bring your own food, which helps. And you can leave the park and return later via the usual wristband/hand stamp route.
I have been with my family a couple of times now, and have had both good and bad weather. Woodlands make a lot of the fact that there is plenty to do in all weather, and I have found this to be true indeed. While bad weather is always going to limit the appeal of such places, Woodlands has a lot of indoor play areas, and these are aimed at kids of different ages, so you don't need to worry about toddlers being knocked about by older kids. Although obviously one has to be vigilent.
We will be holidaying in the area again this year, and will be certainly paying Woodlands another visit. Also, at the moment (27/04/11) on the Woodlands website there is an offer of a 6 day admission for little more than an individual day's price. read more