This is one of the most amazing museum I have even visited, first of all the entrance if free. If you can it is nice to donate some money but if you cannot that is fine too, no one will try to guilt trip you into paying. This will be a day trip as there is lots to see and most likely you will not be able to see everything in one day anyway. The building is amazing and pay attention to the wall’s engravings, there look like church gargoyle but they are actually animals. The dinosaur section is my favourite and the description is detailed so make sure to spend the time reading as well as watching. This is not just for kids so this is a place where the kids as well as adults can learn something from. Nearest tube station is South Kensington. 100% worth a visit! 🦕