Burj Khalifa. The 124/125 observation deck starts around AED 169 ($46) for non-prime hours. Sunset is the premium slot — book 3-4 days ahead — but a night visit costs less and the city lights are arguably better.
Desert safari. Dune bashing, camels, sandboarding and a BBQ camp dinner with shows, from roughly AED 100-180 ($27-$49) with pickup. This is Dubai's best-value evening. Choose a morning quad-bike safari instead if evening crowds put you off.
Dubai Mall and the fountain show. The aquarium wall and the evening fountain shows are free, and the mall connects directly to the Burj Khalifa entrance. Plan one full evening here; it anchors itself.
Global Village. A giant open-air fair of country pavilions, street food and shows, open roughly mid-October to early May. Entry is about AED 25 ($7) — the cheapest full evening of entertainment in Dubai. Weekday evenings are far calmer than weekends.
Atlantis Aquaventure. The Palm's flagship water park and one of the world's largest. Day tickets around AED 329 ($90) — expensive, but a genuine full day. Advance online tickets cost less than the gate.
Dubai Marina. Walk the Marina at night, take a dhow dinner cruise, and get the skyline photos — a cheaper alternative to the pricier Downtown dinner options. Note that Ain Dubai, the giant observation wheel, has been closed for long stretches; check before planning around it.
Old Dubai. Cross the Creek by abra for AED 1 ($0.27), then walk the Gold and Spice Souks and the Al Fahidi lanes. Half a day, and the only part of Dubai older than your parents.