Taking my Dd to London for her birthday in a couple of weeks. We are arriving 9.30am Saturday and leaving Sunday lunch time. We are booked in to see the frozen musical as she is frozen obsessed but this starts at about 2pm I think. I'm looking for something to do with her first. Originally I thought the natural history museum but the earliest available tickets are 11am so not sure if we will have time. I was thinking of an open bus tour but not sure if that takes up enough time. She will be 7. It's her first trip to London. Any suggestions appreciated!