1. Create a homemade tent. Find an area where children can make their own tent or cubby house.  You’ll need a couple of old sheets, clothes pegs a blanket and some rope. Just attach the rope between two trees or poles and the sheet on either side secure with a rock. Children will have hours of fun in their new home.
2. Plant something and watch it grow. Children love to participate in the process of growing things in a garden.  Many schools are encouraging children to be involved in school gardens.  Even if you live in an apartment a windowsill garden is a great place to start.
3. Try water painting.  All children need for this activity is a bucket of water and a brush.  Children can paint the side of a building, learn about evaporation and exercise at the same time.
4. Create a simple treasure hunt. A treasure hunt can also be played indoors, if you are really struggling to find space but its best to be played outdoors so that children can discover their natural environment. Hide treasure and plant clues for children to use their cognitive skills and imagination.
5. Design and build an obstacle course. If you have access to a backyard or park, why not set up a mini obstacle course? You can use old tyres, pillows, cardboard boxes, chairs, buckets, hoops and rope. Obstacle courses are designed to improve gross motor skills and general co-ordination. Children can also learn the concepts of over, under and through and decision making.
6. Plan and take part in an Australian Bush Walk. A bush walk is an excellent way for children to discover and appreciate our unique natural environment. They can use their senses by seeing, hearing, smelling and touching and discovering simple things like the roughness of a tree trunk, the smoothness of pebbles and rocks in a stream or the crunchiness of a dried leaves underfoot. They can marvel at our native animals and listen to the sounds of birds.
7. Plan a sporting match or join a sporting club. Children can develop their sporting skills and learn how to work as part of a team. It will keep them on their toes and encourage physical activity. Bike riding can be fun too and can get the whole family outdoors.
8. Discover camp. Camps are a great way for your child to get active, try different experiences and meet new friends. They will develop skills in a fun, secure and professionally run environment. Children will be able to try new things, make new friends and really come out of their shell. Kids camps are available on the school holidays, or through schools.
9. Visit Nature Play QLD. A FREE activities resource for parents and care-givers which features lots of affordable, family-friendly, educational and fun outdoor activities for the whole family.
10. Book an active family holiday. Active Recreation Centres offer family camps and self-contained accommodation.  You can book for a small or large group. Enjoy an adventurous family holiday and learn abseiling, kayaking and canoeing.

Source: http://www.dsr.nsw.gov.au/schools/benefits.asp