Barb, if you like flowers, once in Grand Falls, you can drive another 30 miles on Route 2 to Edmundston where they have "Le Jardin Botannique". There's also a very nice campground adjacent to it, but it's just semi-serviced, the site we had anyway.
Also, anywhere in New Brunswick, if you are not in a hurry, I strongly recommend taking the scenic route instead of the highway. The highway just has trees to see, not much different from any other highway. From Edmundston to Fredericton, I always follow the scenic route as much as possible. It's the same distance, but the scenic route has a few advantages. There aren't as many big hills because it follows the St. John River, and there's hardly any traffic. Also, it's scenic, hence the name.
It's Route 165 between Woodstock and Fredericton
It's Route 130 from Hartland to Grand Falls, it's a little weird in Four Falls, but with a good recent map, you'll be fine
It's Route 144 from Grand Falls to Edmundston
Going the other way, it's Route 105 from Fredericton to Young's Cove/Coles Island. From there, you can get back on Route 2 (Trans Canada) to Moncton and down to Halifax.
All those follow the St. John River valley and are very beautiful.
Marc...