DIY Sand and Rock Box by FSPDT. Gdjk -> made this with toilet rolls (aka tunnels) and moon sand instead of play sand. My son loved playing with it. The moon sand cleans up nicely indoors but play sand will be easier to play with when using the small cars.
Just a very simple idea for quieter sessions. Pom poms are so quiet. Children get the pom-poms with chopsticks or tweezers. good for counting sorting and fine manipulative. Can be done individually or they could choose a number then race to collect.