Fun with water, great recycled plastic bottle project. This could be pretty if you used wine bottles. It's just a matter of figuring out how to cut a hole in the side.
Backyard fun: 10 Creative Ideas to Make an Outdoor Oasis for Kids this Summer Apartment Therapy
The outdoor chalk board could be cool in the secret garden. Outdoor chalk board would be great for our kids, whilst covering up the old wooden fence
Mud kitchen (also known as an outdoor kitchen or mud pie kitchen) is one of the best resources in DIY projects for kids to play outside as kids playhouse.
Could easily build this trellis from shipping pallets- a fun play area for kids AND a great space to grow beans and other vining veggies.put between play area and garden.