We really like the Springs Preserve. We got married there and our planner was incredibly helpful. Unfortunately, we were there right in the middle of some contract changes, so our initial planner didn't see us through the whole process.
They did a very nice job of setting everything up and making the day pretty stress-free though. They also have a book of local businesses that are familiar with the Springs so that the businesses did a lot of the coordinating. (That was super helpful!)
As far as regular activities, it's a great place for weekend family time. The exhibits are fun and great for kids. For their special functions, it gets really crowded but they do a decent job of keeping things organized. We attended the Easter Egg Hunt and it was packed and also less chaotic than expected.