Infrequent poster but wanted to do a Greenwich trip report (part of a London trip late Sept-early Oct).
Hotel (Novotel Greenwich): Conveniently located near the DLR station, a coffee shop, several restaurants/pubs and all the major things we wanted to see; very friendly staff. My only criticism is that the room was very warm, particularly for a woman of, ahem, a certain age. In fairness, I knew from Trip Advisor reviews that this was an issue and the weather was also a bit warmer than normal.
Old Royal Navy College: Lovely grounds and there's a very nice pub on premises. The Thames was very high and the path along the river was periodically swamped. A dog being walked by his owner refused to take another step and I'm sure was chuckling while his owner dried out his shoes on the grass later. The highlight was The Painted Hall (a/k/a “The Sistine Chapel of the UK”). This is an absolutely gorgeous ceiling, and the person who decided to install the large ottomans in the hall so that people can lie down to properly view it is a genius.
Royal Observatory: The walk through the park to reach this was very nice. Later in the day would have been prime picnic time. As it were, it was nearer to breakfast. Lots of people with dogs (Corgis everywhere!). The Royal Observatory itself is so much more than just the Prime Meridian line (but that is very cool) even if you are not a science geek. It was slightly overcast, but the views from the hill were still great.
Queen’s House: We took the path down from the observatory to the Queen’s House. I’ve not seen much about this on any traditional forum, but it is a seriously impressive attraction (and free!). There is an extensive display of maritime artwork, the Armada portrait of Elizabeth I and, what I found most gorgeous, the Tulip Staircase, which is absolutely stunning.
National Maritime Museum: I enjoyed this more than expected - a variety of interesting maritime-themed paintings, ship models and exhibits here, including the uniform Nelson wore when shot at Trafalgar. I offer with no commentary that there were many children here when we visited, but they were largely contained to the “Great Map” and other play areas.
Misc: At the street food fair near the Thames, there's a stand serving great Pimm’s cups. I’ve tried to make these 20 times and they've ranged from undrinkable to merely bad. I don’t know how you Brits do this, but hats off to you. We also walked the tunnel under the Thames to the Isle of Dogs and back. Having a pathological fear of water, I'm not sure why I thought this was a good idea (blaming the Pimm’s cups here and fine, I had 2). The street fair is not to be confused with the Greenwich Market, which is a delightful warren of shops, food stalls and booths to explore. We highly recommend the gelato at Dark Sugars.
Sunday roast: We’ve never been able to make the timing work on prior trips. We went to the Plume of Feathers and it was very, very good - DH had the roast beef and I had the stuffed roasted chicken. Both came with roasted potatoes, cauliflower cheese, other veggies, Yorkshire puddings and delicious gravy. The place was full of locals watching horse races, very much like our hometown, and the best part is that I apologized for almost spilling a pint on what I thought was a man’s hat laying on the bar only to find out that it was, in fact, a cat (and a very handsome cat).