Fortunately, my sample size of great grandmas doesn't include any incredible bores. There's hope for me yet.
First thing to remember, great grandchildren-to-be, is how fortunate we will be to get to know each other....how marvelous and amazing it will be for me to have held in my arms, whispered nonsense to, held hands with and tickled toes of not just your mommies or daddies, but your grandmas or grandpas....and now YOU! I didn't know my great grandparents: I couldn't even tell you the names of all of them, though I do have photos of some of them on the walls of my guest room. These great grandparents only figure in a few tales left behind by my Granny, who had the urge to write them down so her grandkids would hear them, and your great grandpa Blake's grandpa who told dozens of stories to his grandsons...then they remembered the funniest ones and told their kids, too.
So...maybe that's my very first bit of advice, even if it's not the most important or most useful: Tell your children stories...even when they don't ask to hear them. Take the pictures, go to the cemeteries, pass on the traditions. Build your family brick by brick and connect your past to your present. You have roots, kids, and they reach deep in the country you have come from, or your folks came from. I learned to love your great grandfather because he told stories of his town, his parents, his farm, his history...funny stories full of character and idiosyncrasy. I learned to know your Great Grandpa's family from afar...before I came to Atchison county to join them and grow roots here myself. You come from a long line of storytellers...
Travel. Travel cheap when you're young and pack sandwiches and cereal and milk and your one hot meal a day is cheap Chinese or cheap Mexican. Stop for historical markers and local museums and national parks and pose one or more family members in every picture. Climb trails and skip stones on lakes and toss pebbles into creeks and pick up rocks as souvenirs.