I like to keep my under 2's away from the swings when possible... so putting a sandbox under the climber swingset is not a good choice for me. In my yard I have a separate over 2 and under 2 area aswell as a sandbox (large enough for 4+ kids) and a space for soccer/ball activities. Each area is in a different part of the yard. My liitle one know that they are not allowed to go near the swingset/climber/fort thing, and the bigger kids know that they are not to play in the toddler area.