Start at Belvedere 21, the sleek modern-art counterpart to the palace complex, and it’s a smart way to ease into the day before the heavier, more famous collection upstairs. It usually opens around 11:00, so if you’re going straight from breakfast, aim to arrive just before opening and spend about 75 minutes here. The building sits by the Rennweg side of the Belvedere grounds, easy to reach on the D tram or a short walk from Wien Hauptbahnhof; tickets are typically in the mid-teens, and the pace is pleasantly airy if you like sculpture, video work, and contemporary installations without the crowds you’ll get later.
From there, walk through the grounds to Lower Belvedere & Orangery, which gives you the more historic, palace-side feel first: ornate rooms, rotating exhibitions, and the kind of baroque setting that makes the whole complex click. Plan about an hour and a half, and don’t rush the garden paths between the buildings — the sightlines toward the city are half the pleasure. For lunch, Salm Bräu is the ideal nearby reset: hearty Schnitzel, roast pork, and house beer in a relaxed beer-hall setting on Rennweg. It’s popular but not fussy, and you’ll do well with around €20–35 per person; if you want an easier seat, get there before 12:30 or after the main lunch wave.
Save Upper Belvedere (Belvedere Museum) for after lunch, when you’re ready for the big-ticket art without feeling rushed. This is where you want to slow down for Klimt’s The Kiss, then wander through the Austrian masters and the rest of the collection at an unhurried pace — two hours is about right if you actually want to enjoy it. The palace opens from late morning into the evening, and timed-entry crowds can build, so buying tickets ahead is worth it if you’re visiting in summer. Afterward, cross into the Botanical Garden of the University of Vienna just behind the palace grounds for a calmer 45-minute walk; it’s free, wonderfully low-key, and a good palate cleanser after all that gilded interior space.
Wrap up at Café Goldegg in Wieden, a short walk or quick tram ride from Belvedere, for coffee, cake, or a final glass of wine before heading back. It’s the kind of elegant neighborhood café where you can sit for an hour without anyone rushing you, and €8–15 should cover dessert and drinks comfortably. If you’re heading toward Wien Hauptbahnhof afterward, the transfer is easy on foot from this part of town, so you can end the day with a slow stroll instead of another transit hop.