Heaven is:
Heaven is not, strictly speaking, a reward we earn; it is a gift we freely, gratefully receive.
Heaven is rewarding like nothing else ever offered to us because it satisfies every human need and fulfills every human longing.
None of us will walk around heaven wearing a crown.
Any "reward" will be recognized as another token of grace.
The only reward we anticipate is to be in the presence of Father, Son and Spirit forever, in the place of love's endless empowering embrace.
In the End (which is the new Beginning) Heaven is the restoration of all things under the just and merciful rule of God.
The New Heaven and New Earth are fused in the New Creation where righteousness and peace reign forever.