Explore Brussels' UNESCO-listed central square, admire the ornate Town Hall façade and learn the city's history; the square is open all day with best light in the morning.
Take a one-hour covered canal cruise for a scenic orientation and history of Amsterdam; operators run cruises all day—mid-morning departures avoid late-afternoon crowds.
A short morning flight (~1h30m) saves time versus overnight rail; allow time for airport transfer and security—flights depart early and arrive mid-morning.
Tour the former imperial summer palace and stroll the formal gardens—palace tours run throughout the day; check the palace's last-entry times seasonally.
Visit Vienna's Gothic cathedral in the city centre—interior is open into the evening though tower access closes earlier; check tower hours if you want the view.
Visit the Gothic cathedral and take the lift or stairs to the rooftop terraces for panoramic views; rooftop opening hours vary but generally run through the day—book early slot if you want quieter views.
Wander Geneva's cobbled streets, visit the cathedral and see the archaeological crypt; attractions generally open into the afternoon—check tower times if you want panoramic views.
Take the S-Bahn and a short walk up to Uetliberg for sweeping city and Alps views at sunset—trains and trails are open year-round but check the last train times.