Summer holidays so if you go on a hot weekend expect it to be busy. Damp days will be better, and weekdays help too.
-SAW The Ride - unbearable queue cattle pen - usually quite popular. Decent shout for fastpass
-Nemesis Inferno - more bearable queue line - can be quick moving queue if fastpass sales are low - i always think the fast pass guys get a good deal on this.
-Stealth - from memory this opens slightly later - about 10am so best try and hit this 2nd/3rd to avoid queue. Probably most worth the fast pass for a reride.
-Collosus - decent queue line experience, however can generate an obscene queue due to bad ops.
-THE SWARM - doesn't usually generate much queue line in my experience, however, best ride at the park.
Things to do in London?
Borough Market is a great place to get street food although its a bit expensive, they have cake stands aswell though so could get something sweet for a more reasonable price.
London Zoo is a very good zoo - you can get 2for1 if you buy a national rail train ticket (literally buy a single 1 stop down the line for the day you visit if your not travelling by train already!)
https://www.daysoutguide.co.uk/zsl-london-zooVarious museums - the last one i did was the design museum which was fun - the free exhibition isnt fully open mon-wed though
https://designmuseum.org/exhibitions/de ... aker-user#Parks - Regents is near the zoo, Hyde isthe biggest and has a lake i think you can rent pedalos on and greenwich park had the meridian line (official line for the GMT timezone)
Feel free to pm me if you have any other questions or post here. I'm from Birmingham but i work a lot in London and my wife is from there so i have a fair bit of experience.