How would you design the city of the future?

I am no town or indeed city planner so this is entirely a personal fantasy. My city would be a port with a large deep river flowing into the sea.

The river would have islands.

And bridges.

The central area  would be traffic-free and would have independent retail outlets and restaurants, parks, libraries and cultural destinations. Book shops and cafes would edge  the canal banks while other retailers would cling to the river banks. Low rise mixed use accomodation for holiday makers and long term renters would  create calm and shaded squares and back streets. Most importantly the streets would be paved and cobbled with trees providing shade. The real world would be held at bay by the river and canals so the central space could be a kind and comfortable beating heart of the bigger city. A place to connect with people, or not, and to expand thinking and life experience before returning to the real world via water based public transport.

In this fantasy I am simply a city centre kind of designer. The money making, practical and essential suburbs are someone elses responsibility.