Who fits which axis
Thrill rides and queue patience: USS. Toddlers / indoor ocean storytelling: Oceanarium (2025 rebuild — not an old one-hour dash). Sand and sunset only: Siloso / beach belt, skip park tickets. Decision line: do not run Oceanarium / USS / wax museum as three tickets one day — secondary indoor tickets wait for another day or skip.
Supply at VivoCity — Express is extra
Sentosa Express leaves from upper VivoCity — not on MRT or Tourist Pass. Supply before boarding; island food runs pricey as expected. Cable car is another ticket.
Common mistake: same day as Mandai or the Bay
Sentosa is a south-island ticket day. Botanic Gardens in the morning and Supertrees at dusk means transit ate the itinerary. Adventure Cove is also either/or with USS / Oceanarium.