Alberta Tourism Parks and Recreation said "The reason they gave us was that expectations were different from our end than there was on theirs of what was involved in the competition."
[A] spokeswoman for the Swiss-based non-profit organization, told the Calgary Herald from Belgium the Alberta park didn't make the cut because, well, there's not much to do there.
"What happened is that they couldn't fulfill some of the requirements we needed, and it had to do with activities that people could engage in," she said.
-from Calgary Herald June 18, 2009
This sounds a little strange to me - a natural wonder not dependent on man made entertainment, and it is disqualified for lacking things to do. What is there 'to do' at Uluru? Sure you can hike there, and climb the rock - can you still climb the rock? What about those atolls in the middle of the Pacific?
Anyway, the Bay of Fundy is not lacking. It is home to a variety of unique marine species and serves as the summer feeding area for half the world’s population of endangered North Atlantic right whales and 12 other whale species. There are fossils galore, and it is a UNESCO World Heritage Site as as biosphere reserve.
So, there is whale watching, birding, and hanging out on the water in sailboats, canoes, kayaks, or swimming. There are cruises and whale watching tours. There are the fossil cliffs to see. And that amazing tide.
See here for more about the tide and the Bay of Fundy.