I imagine that I will be reunited with deceased loved ones, as well as meet ancestors, canonized saints and historical figures (especially those whom I have written about and/or ctb). I also imagine Heaven with an immense but exceedingly well-organized library, with all sorts of books and historical documents. I would be able to spend as much time as I want with the books and documents (well, time does not really exist in Heaven, but I think you know what I am trying to say), and instantly have perpetual full knowledge of them. Boredom would be impossible in Heaven.
I imagine that I will be wearing a lovely white gown (rather like a fairly modest wedding gown) that is impossible to stain and can reflect all the colors of the rainbow: I suppose all the women and girls in Heaven will have similar long prismatic white dresses, but in different styles reflecting the fashion of the era in which they lived. (I have not yet thought about the afterlife fashion of the guys in Heaven
) Those who lived to be at least 33 (Jesus' age when He died and was resurrected, according to tradition) will be that age in Heaven (those who died at earlier ages will be the age at which they died, except for infants and the unborn: I suspect that they will probably be at the toddler stage). Like
@InkBlot I imagine "the ability to see the entire universe without the constraint of time."
Anyway, it is difficult to describe a supernatural state in human language. All that I am sure of is that Heaven will be infinitely wonderful beyond my wildest expectations -- if, God willing, I make it there, of course