Pick the dinner cruise if evenings are free but your days are packed — it slots into any itinerary and needs no energy. Book a window-side or upper-deck table category if offered; sunset is the show.
Pick the Lembongan day cruise when you want an easy family sea day without organising boats, gear and lunch separately. It is pricier than a DIY trip, but everything works and nobody haggles.
The glass-bottom boat at Tanjung Benoa is the budget option for small kids — short, calm and cheap. Manage expectations: the "Turtle Island" stop is a small conservation pen, not wild turtles.
Skip cruises altogether if your trip already includes a Nusa Penida tour and a snorkelling day — a third boat day is usually one too many. See the Bali guide for balancing sea days and land days.
Two booking details worth knowing. Most cruises include hotel transfers from Kuta, Seminyak and Nusa Dua, but Ubud and Canggu pickups often cost extra or are not offered — check before you pay. And dinner cruises usually sail in light rain, only cancelling for rough seas, in which case operators offer a refund or a new date.