Arrive Stratford by train then take the Central line/TfL Rail to Mansion House or St Paul's area; walk to Poppins Cafe for a light breakfast and coffee before exploring St Paul's Cathedral precinct.
Short exterior photo walk around St Paul's Cathedral, including the Millennium Bridge viewpoint for skyline photos and a quick peek at the cathedral façade and crypt from outside if you prefer to skip paid entry.
If you wish to enter, visit St Paul's Cathedral (dome and whispering gallery optional) - pre-book tickets or join a short guided audio tour to save time and capture panoramic photos from the galleries.
Stroll along the Thames via the Queen Victoria Street/Queen's Walk route toward Tower Bridge, stopping for riverside photo ops at the Millennium Bridge and the Shakespeare's Globe exterior on the way.
Arrive at Tower Bridge for photos and, if desired, a quick visit to the Tower Bridge Exhibition (glass walkways and engine rooms) - great for dramatic pictures without a long detour.
Walk south across the bridge to Borough Market; browse stalls, sample street food and pick a stall for lunch - popular options include Kappacasein toasted cheese, Padella pasta (queue permitting) or international street food stalls.
Wander the lanes around Borough Market and grab a coffee from Monmouth Coffee Company or a sweet treat from Bread Ahead while watching food stalls and snapping vibrant market photos.
Walk east along the southbank to the HMS Belfast (exterior photo op) and the London Bridge area, then detour slightly to visit the free galleries at Hay's Galleria and the riverside for skyline shots.
Head to The Shard surroundings for panoramic views from the riverside or, if you prefer an inexpensive indoor stop, explore the free exhibits at the nearby Tate Modern Turbine Hall entrance and riverside terraces for dramatic photos.
Cross back toward the north bank and stroll through the historic Leadenhall Market for atmospheric Victorian architecture and boutique shops-great for portraits and a short shopping break.
Take the Tube (Circle/District from Monument) or a short taxi to St Katharine Docks for a quieter riverside walk, marina photo opportunities and optional drinks at The Dickens Inn.
Board an Uber Boat (river bus) from a nearby pier (Tower Millennium Pier or St Katharine Pier) toward the Royal Docks; enjoy golden-hour river views and capture sunset photos en route.
Arrive at the Royal Docks and take the Emirates Air Line cable car across to The O2; the cable car offers unique aerial photos of the Thames and Docklands as you glide over the water.
After the cable car, arrive at The O2 and stroll the exterior rooftop walkway for skyline photos, then head inside to explore the green-lined high street of bars and shops.
Grab dinner at Gaucho O2 for steaks or choose a relaxed option at O2 Food Market stalls, sampling street-food style dishes while people-watching in the concourse.
If you're up for a light adrenaline boost, book the short climb experience at Up at The O2 for panoramic night views (pre-booking recommended) or take photos from the viewing platform outside.
Catch some live entertainment: check listings for gigs or comedy at the O2 Arena (if a show is on) or enjoy free live music and DJs in the O2 concourse and bars.
After the show or evening wandering, relax with dessert or a nightcap at Duke's Brew & Cue or The Bridge Lounge inside the O2 complex while reviewing the day's photos and videos.
Take the Emirates Air Line cable car back to the Royal Docks for night-time aerial photos, or opt for the Jubilee Line from North Greenwich tube station for a quicker return to Stratford.
Board the Tube at North Greenwich toward Stratford; use this time to unwind on the journey and prepare for the train connection back to Stowmarket from Stratford station.