I took seasickness medication beforehand. The sea wasn't too windy that day, but there were still some swells, and I felt a little seasick when the boat first set off at a low speed. The boat was very clean, and the crew was very attentive to service. We didn't see many whales that day, and the ones we did see weren't very big; I only caught a glimpse of a whale's tail once. Overall, it was a good experience. The only downside was that it's about a 2.5-hour drive from Christchurch, but thankfully, the journey passes through vineyards, and there are a few wineries worth visiting.