It was a brilliant day for it! I hope they really enjoy the rest of their stay. The architectural cruises are fun and the river has earned a second life...
Nothing ending to the stuff they can see and do. LOL just gotta dig down deeper into the pockets. Free stuff like the parks are only a short ride or walk away. Tell them not to miss Buckingham Fountain at night. It's incredible and you have the whole skyline behind you.