The Bible tells us some things about Heaven but not too many. It certainly doesn't get into all the things we'll be doing for all of eternity. Sure, we'll sing and worship, but what about when we're not doing that?
While I can't guarantee exactly what you'll be doing in Heaven, I do think we may as well assume that we can do whatever we want. Feel free to stretch your imagination to its limit. This isn't your everyday trip planner we're talking about here. This is God. One thing I think we can assume about Heaven is that *we won't be disappointed*. Now, if you stretch your imagination to its limit, won't you be disappointed if you're told, "I'm sorry; you can't do that here...(not even in Heaven??)"
Recall again, this is God we're talking about. So, if you don't get to do the most amazing things that you imagine, guess what? God must have even better ideas! It wouldn't be so surprising after all, now would it? Recall what Ephesians 3:20 says about God. "...Him who is able to do immeasurably more than all we ask or imagine..."
That being said, feel free to imagine doing whatever you'd like in Heaven. Sure, you may never do it, but if not, that just means that you're doing even more amazing things for all eternity.
So throw all the laws of physics, space, and time out the window and begin to imagine a miniscule portion of all that Heaven can be.
How about being able to go to any place and time? You could witness all of history firsthand. You could watch the Bible heroes live out their stories. Watch Noah build the ark. See Moses lead the Israelites out of Egypt. David's battle with Goliath. The birth of Jesus. Jesus' ministry, death, and resurrection. Watch the apostles spread the gospel...
What could you do with a sport? Play as long as you want without getting tired? Simulate your earthly body's stamina...until you decide you want to "reset"? Try someone else's stamina or skill level for yourself? A professional athlete's? Anyone who ever lived? Play as a hulking 300 pound muscleman? As a 5 year old girl? Never go after your ball (unless you want to)...have it reappear in your hand?
Relive the best times of your life? Live times of other people's lives? Be any age you want? Look like whoever or *whatever* you want (and still have everyone recognize you!)?
Impressed by Heaven yet? These are just my ideas. God is the one who's designing the place, and He's able to do immeasurably more than all I imagine...