Crow’s Nest (270 seats) is a fore-located observation lounge with panoramic windows, its own bar and large dance floor. The lounge is also used for pre-scheduled events by the Holland America Line's enrichment program, which includes daily dance classes, trivia games, cards playing, karaoke, HAL Cats (8-piece party band) performances, live grand piano performances (in the afternoons and evenings). Crow’s Nest becomes a disco (dance club) at night, with live DJ music and dance contests. During the ship's last refurbishment, the Crow’s Nest bar lounge was renamed "Explorations Central" and its interior was redesigned. The new venue's programming additionally features multimedia series of interactive videos and guides related to the visited destinations part of MS Oosterdam's itinerary program. The new Explorations Central (abbrev EXC) provides digital media (videos, ebooks, maps) which passengers can access via Wi-Fi during the current cruise, but also online (before and after the voyage). At the Explorations Central there are also paperback books and paper maps for all the visited by the ship destinations and ports of call.
Explorations Cafe (80 seats patisserie and specialty coffee bar), also serves as the Oosterdam ship’s Library (librarian services, guest lecturers, board games, puzzles, book discussions), and as the ship’s Online Centre (Internet computers room/by partnership with “The New York Times”)
Sliding Dome Cover (retractable glass roof over the Oosterdam’s Lido Pool area) with solar panels.
The Loft Lounge (teens-only club area for 13-17 yo, open 10am-12pm, breaks between 12-2pm and 6-8pm; capacity 32 teenagers. has Video Games Arcade, PlayStations, big TV screens, Tennis Tables; with complimentary supervised youth program, activities include teen disco, karaoke, movies, sport contests, themed parties)
Club HAL (kids lounge and play area with 2 separate rooms for children 3-7 yo and 8-12 yo, complimentary youth programming with supervised activities; open between 9am-11pm with some pauses, depending the Oosterdam ship location/at port or at sea; bookings required).
During the 2016 refurbishment, the sunbathing area (with loungers, tables and chars) was replaced by Observation Deck cruise cabins from VB10001 to VB10026, of which category Deluxe Verandah (VB) and K-Interior rooms (Large or Standard).