NintendoLand is great imo, really uses all of what the GamePad can do

Try the Skylanders franchise. It's amazing and sometimes expensive.

toads treasure tracker is really good

brickerton sure had a fun time with toads treasure tracker

Super Mario 3D World is especially great for multiplaying & Breath of the Wild is also great, even when you mod it (may need SDCaffine tho)! ^o^