We are thinking of heading down east this summer for maybe 10 to 14 days. I'm not even sure where to begin. I have googled and found many, many driving trips and things to do, but there is so much it is overwhelming! At first we were thinking NS, NB and PEI, but now I am thinking we are being ambitious? There will be four of us, two young teens included. Does anyone have links, ideas, experiences, etc to help guide me a little? I'm thinking some beautiful scenery, seeing the ocean/whales?, maybe Anne of Green Gables, and otherwise just relaxing and exploring and enjoying somewhere we have never been. I'd appreciate any help

Thank you so much!!!
I'm the opposite, I live in NB and yes, you can easily touch on major attractions in those three provinces in 14 days, no question, and not as crazy-busy as it might sound when you read it.
So you'll come to NB first, the things to see/do there:
TreeGo! near Mactaquac, NB. This is in a really nice provincial park that offers a small freshwater beach, beautiful golf course, very nice nature trails, and then TreeGo! itself is a really cool zipline/obstacle course, which I imagine would be a hit for your kids. Spend a day at Mactaquac, go in and spend the night in Fredericton.
From there, drive to Saint Andrews, NB (2 hours from Fredericton). This is a beautiful sea-side town that offers lots of quaint shops, beaches, a nice aquarium, and oodles of whale watching aboard tall ships (Jolly Breeze is our favorite). I would spend a night here.
Then drive to Fundy National Park area (about 3 hours from Saint Andrews), oodles of walking trails/scenery, do Hopewell Rocks and Cape Enrage (lots of activities including kayaking, rappelling etc), there's some really nice horseback riding through the marshes. I would spend 2 nights in this area so you're not so rushed, but you could get by with 1.
(There are soooo many other things to do in NB, but these are some quick ones off the top of my head for your age group, and also, trying to keep you on a direct line as possible driving-wise for doing the three provinces. If you wanted to add a day in NB, and you're really into outdoor adventure, if you're coming into NB from the north (entering from Quebec border) I'd recommend spending a day hiking Mt. Carleton, it's stunning. If you're into history, you could do Kings Landing Historical Settlement Village which is really nice, we love it so much we buy season passes every year. It's only about 15 minutes from Mactaquac, so you could spend the morning at Kings Landing (plan on about 3 hours there, have lunch at their restaurant, Kings Head Inn, then do TreeGo in the afternoon).
I would then head into Nova Scotia. There's lots to see and do in Nova Scotia as well. Annapolis Valley is really nice, there's a beautiful lake with a beach in Kejimkujik National Park. There's beautiful vineyards, and you could visit Fort Anne. However, going down into Annapolis is kind of out of the way, and myself personally, I'd drive straight to the Halifax area (about 3.5 hours from Fundy area). I can give you a link to a great hotel for that area. In Halifax visit the Public Gardens, Citadel Hill, stroll the water front, go out to Peggy's Cove. I would definitely spend 2 nights in Halifax.
I would then drive up to Cape Breton. Spend a minimum 3 nights here. Baddeck (3.5 hours from Halifax) is the perfect place to stay, take the afternoon of your arrival day to relax and meander around Baddeck, it's a great area. Do the Cabot Trail (stunning scenery) the next day. Then take the next day and drive into Sydney (about 1.5 hours away) and tour the Fortress of Louisbourg, or just take an R&R day and enjoy more of Baddeck. Baddeck is great and has quaint shops, you can go sailing on the Bra D'or Lakes (beautiful), tour the Alexander Graham Bell museum (really neat), there's beaches, great Celtic cultural offerings etc...
Then, I would drive down to Caribou, NS (about 2.25 hours) and take the ferry to PEI (crossing is 75 minutes). Drive to Charlottetown (30-45 minutes away) and spend the night here. I'd probably spend the afternoon relaxing, then stroll down to the waterfront for a nice supper, and then go to the playhouse that night and watch the Anne of Green Gables musical. Then I'd probably spend most of the next day meandering around the city, then drive up to Cavendish area (about 35 minutes away). I'd probably spend 3-4 nights here. Go deep sea fishing, visit Green Gables, if you enjoy golfing there are oodles of splendid courses, go to Sandspit or Ripley's Believe it or Not Museum, visit the beach, take a day and just drive and see the beautiful sights, the red sandstone cliffs are so beautiful...
Congratulations. You've just toured the 3 provinces, hitting on some of the major highlights, in 12-14 nights
