Depart from central London in the early morning and travel by Eurostar train from St Pancras International Station to Brussels. During your roughly 2.5-hour journey, gaze out over the picturesque countryside of southern England and northern France, and perhaps enjoy snacks (own expense) from the trolley service.
On arrival in Belgium’s capital, enjoy the best part of the day to explore at your own pace. Perhaps begin with your included hop-on hop-off tour to get your bearings and see the city’s highlights. Show your ticket, step aboard the double-decker bus, and admire the landmarks from the comfort of your seat.
Enjoy the panoramic views of the European Union district with its striking governmental buildings, see monuments such as the Cinquantenaire Triumphal Arch, and hop on and off to explore the places that interest you most.
Perhaps jump off at the beautiful Grand Place, where you can admire the medieval guild houses, and relax over coffee at the open-air bars. From here, maybe walk to the Statue of the Peeing Boy (Manneken Pis) — the 17th-century bronze statue of a boy urinating into a fountain that has become a quirky emblem of the city.
Alternatively, continue the sightseeing rounds by bus, or set off on your own. If you wish, make your way into the Art Nouveau district to admire its swirling, early 20th-century architecture, or dip into the swish chocolatier shops, antique emporiums and boutiques of Sablon Place (Place du Grand Sablon), one of Brussel’s prettiest squares.
When you get hungry, break for lunch (own expense) at any of the inviting restaurants or pubs, and then use the afternoon to cover other must-sees such as the iconic Atomium sculpture, the Royal Palace and more.
When the time comes, return to the station for your train back to St Pancras, where your day trip ends.