Entertainment is low-key, with very little going on during the day. Occasionally, there were dance classes and Ping-Pong challenges, but on my cruise, there weren't any guest speakers. This changes on the more adventurous expedition cruises, when there's a full program of speakers, with lectures in English guaranteed.
Most people go ashore during the day, and the shore excursions sold very well (and were excellent and reasonably priced). Some lie by the pool, and some use the spa, but Le Boreal passengers aren't the kinds of people who need constant stimulation; a lot would simply disappear for the whole day and show up at sailing time, having eaten ashore.
In the evenings, there was an excellent jazz singer in the Karikal lounge and, on some nights, there were dance shows in the theatre, which were good, if not cutting edge. One night, the dancers performed tangos on the pool deck, which added to the atmosphere of a hot Mediterranean night.
What really stood out was the late-night disco on Deck 6, which was superb; a proper, professional D.J. played a good mix of contemporary sounds. The disco drew the crowds, as well as the officers, and it was the social hub of the ship on many a night. But we got the impression that each ship of the three has a distinct personality, driven by the hotel manager, so if the hotel manager doesn't hire a D.J., you might not get the same level of nightlife. A friend who had cruised on sister ship Le Soleal said it was completely different at night, much quieter and with a much older age group. And, indeed, the Karikal lounge was very quiet after dinner; people seemed either to go dancing upstairs or to go to bed.