I didn't think Wonderland was that good, and certainly not for what they charge. It's a gimmick. The nearby Smurfland is ok, but not the "theme park" right next to the hotel. I went with another family with kids, and we're not going back again.

Depends on how old the kids are. If they're little (like 6-9) they might enjoy the Smurfland.

All that said, it's a gimmick, but worth going once.