The Trip to Bay Bulls for the whale watching is a must.
Cape Spear/signal hill is a great 4 or 5 hours.
Ferryland and Placentia area is interesting.
Trinity Bay is close to my heart, so you have to drive around that

See where the First Transatlantic cable came ashore in hearts content, if you need to feed your inner techno geek while you're out there :P Also when you get to Dildo, you gotta get the obligatory picture under the " DILDO --> " sign.. There's also some really amazing history around dildo, and dildo Island if you wanna research that a little too. You can often see whales, if you just park on the side of the road in there if the timing is right.
If you do goto bell island, make sure you find where the guns were mounted to sink the German subs in WWII, it's crazy to stand there and think the war was that close.
You can drive out to Bonavista and see how Dan Ryder is doing for yourself...
If you start driving across the province, The beaches around Eastport are real nice, sandy kinda beaches. Speaking of beaches, the ones around Burgeo on the south coast are awsome but that places is a LONG ways outta the way. In burgeo, the dialect is so strong even "newfies" have a hard time understanding what they're saying.
Gros Morne and L'anse aux Meadows are definalty great places to see.. Especially L'anse Aux Meadows, if you're able to put yourself "back in time" kinda thing, There's no other place close you can get the same sense of "History" and what it must have been like. Gros Morne is great if you're into hiking and stuff, it loses a little for people who see the rockys every day.
Don't be afraid to talk to people on your drive around the bays, you never know when you'll find someone who'll invite you to do something interesting, and if you see someones house decorated with an obscene amount of some decoration, stop and ask if you can take a picture of their house. Some will say Yes, some will give you a story associated to every piece.
Don't have it hyped up too much before you go, people live there like everyone else so it's not like a Vegas strip or Disney Land vacation. The true sense of the place comes from the people who live and work there everyday not the "tourist" traps. Keep your expectations in check and you'll come away in love with the place...
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Kitchen Measures