There are boards and a net that can be placed on top of the pool table for playing table tennis. Be careful when moving the boards, because they are heavy and it's easy to damage the corners when lifting it. Always be at least 2 people when lifting the boards.
There is a large box of mixed LEGO bricks at your disposal in the activity room. The round foot stools (ottomans) are hollow and coincidentally work really well turned upside down for storing the LEGO bricks for more easy access while playing with them.
There's a large stack of Donald Duck magazines in a box in the activity room. These are great for when the kids are tired after the pool or before bed time, or in the morning before the adults wake up. They can be taken up to the mezzanine to be read in a bean bag for a bit of quiet time.