we did the private walking tour of lantau island, including the big buddha and tai o village. Our guide (Alex) really tried to find special things to entertain our young girls, pointed out good locations to try street food, and found us a nice spot for lunch on the beach. Having a guide was great, because navigating the queues for the cable car aren't straight forward and she was able to show us more of the village than we would have explored on our own. Unfortunately we didn't see any dolphins but that is a gamble with any tour. Though we had younger children (5-7), there is a lot of walking on this tour (probably around 10K steps) and it wouldn't work well with strollers. We only did this one tour with the company but Alex was very knowledgeable about the city and could likely do a great job with any of their tours.