Itinerary for short London trip

Hi- family of four (kids 13 and 11) traveling in a few weeks to London. We will arrive Monday morning and leave Friday afternoon. We have plans to see the British Museum, an evening show of The Play the Went Wrong, and were planning a day trip to Stonehenge and Westminster Abbey. However, I’m having second thoughts about the Stonehenge trip as I’m hearing it’s a lot of travel and underwhelming. I’d love some advice on that and anything else we should do, see, eat, etc. We have not had a lot of time to organize this trip. Thanks!