On a budget, weigh it — Uber Boat by Thames Clippers (river ride) isn't cheap for what it is.
£15–£30
The genuinely good move on the river isn't a narrated tourist cruise — it's the commuter Uber Boat by Thames Clippers, which passes the same icons for a standard fare. Grab a seat at the back, tap in with contactless, and ride it down to Greenwich for a half-day with a destination at the end.