The Sport Court (aft Deck 11 - Observation Deck) allows guests to play pickleball on multiple courts with incredible (and distracting) ocean views.
At the Sport Court if you're new to pickleball, HAL's Cruise Staff will teach you the basics with free beginner's lessons. More advanced instruction is available for a fee.
If you're a pickleball tyro, you can play in a pickleball tournament at sea. And HAL is offering commemorative pickleball starter kits for use as souvenirs or gifts (available in the ship's Shops).
You can also play basketball (half-court) and kick around a soccer ball in addition to Pickleball as well as those seafaring standards, Shuffleboard and Cornhole. Personally, I'll be sticking to shuffleboard.