Where do I spend the last night after a liveaboard?

It depends entirely on the destination and liveaboard you are going to. For example in Egypt it is quite common to spend the last night in a hotel (shared double room and half board). But normally you stay the last night on board the boat. This applies to all liveaboards. The boat's schedule and bookings may mean that they sometimes choose to move you and other guests to a hotel, however.
You will of course stay in a single room at the hotel in that case if a single cabin was booked for you on board the boat..

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