We built a GIANT sandbox for our son. It was a LOT of digging, but we are heroes. We spend hours every day building pools and rivers and burying trucks. It is so much fun. We've had to fill a little pool nearby to clean up in before we go inside cause it gets pretty messy.
The best part is that our neighbour brought the sand in a giant backhoe - nothing more thrilling to a three year old boy - except for maybe a school bus.