I am traveling to London for the first time this August and I have a pretty jam-packed itinerary for 3 days. As a first-timer, what museums/attractions do you believe we should definitely have a guided tour for? Which places do you think I will be okay browsing without a tour? Any non-touristy places that I should definitely look at within London that I do not have to travel more than an hour for? All recommendations are welcomed, thank you!