You are damaging your children further by constantly creating this illusion of a happy family.
I think I might be a dissenter on this ONE issue. My H and I have discussed this, and we also think it's okay to do things together, with our kids.
However...
There has to be a good reason for us to do it together. The difference between me and Kevin is, I don't go into it thinking...please love me. I go into it thinking...please help me show them that we can be a divorced family and still be happy.