For one thing, besides what yoiu may already know, there is no need or secrets and gossip, nothing to hide, we can eat if we want to, there's no need for sleep. We will have all eternity to interact with a great multitude. In other words, heaven will be a place of infinite learning. Just getting to know everyone will take eternity!
Another thing, Jesus said heaven is paradise and His interpretation of paradise is a park, or forest, or orchard, like a Garden of Eden [I'm glad I don't like apples].
Let's speculate...Has God created this immense universe as our "Garden" for all eternity? Will we have access to the stars? Perhaps He will assign a galaxy to each of us, with the rewarding work of developing it for His glory? We can even visit the Gardens of our friends. How will be travel to and from each galaxy and to God? I heard we just think of where we want to go and we are there!! Cool!
I can dream can't I? Stop and think for a moment...God created billions of galaxies, more than people. We won't have use for stars, suns, galaxies in heaven when it is always daylight. OR, are they for the next creation of humans on another planet that we don't know about?