If you fancy giving it a go, take 8 garden canes, each around 2 m long and put into the ground in a semi circle. Adjust the position of the canes to allow for a play space inside and a gap for the doorway.
Angle the canes inwards, and tie securly to form a tepee shape.
Take some runner bean or sweet pea plants and sow two or three next to each cane.
Water regularly, and as the plants grow gently train them around the canes.
One tepee is big enough for two children to play in, so if you have the space and lots of children why not grow several. And as the summer progresses the play den will produce lots of lovely flowers or beans as the plants grow!