When working with a Child of Trauma, keeping things simple and non-stressful is critical aiding in the bonding process. Sometimes this might simply be sitting on the couch watching tv. You can also engage in simple card or board games. Getting down on the floor and playing with your child is a great way to bond as well.
I like doing things out of doors. You need to be fairly far away from the hustle and bustle of traffic and people - kids who have traumatic backgrounds often have difficulty focusing when there is a lot going on around him or her. So, what do you do out in the middle of a field? What can seemingly be magical but is relatively easy to do?
Head to the local dollar store or the grocery store. The cheap $4 kites fly remarkably well and are inexpensive enough that you won't care if they get destroyed.