#1 & #2 Climbing, always climbing. For once you were scaling something intended for the purpose. A really kid-friendly way of reaching an underwater viewing pod at the Aquarium. This was definitely your favourite bit; we had trouble moving on.
#3 Up close and personal with your new favourite creature, the Zebra Shark. It seemed to develop a similar curiosity with you in return. And I agree with you totally; it’s spotty, not striped.
#4 Hanging out in a mini viewing pod. You were still and mesmerised rather than highly energetic like your brother.
The Nausicaa Aquarium in Boulogne is really worth a visit. For us, living so close to the Eurotunnel crossing means a trip here is actually cheaper and probably easier than visiting a sealife centre at home. A £20 return crossing, half price entry and a tasty french meal before heading home at bed time ticked all the right boxes. A wonderful learning opportunity and a pretty mesmerising sensory experience all round.