For something a bit different, why not take a submersible expedition to view the Titanic. It runs out of St. John's, Newfoundland; where you board the Russian research vessel Akademik Keldysh.
Canadian RMS Titanic submersible shipwreck expedition dives St. John's Newfoundland Canada Akademik Keldysh IMAX documentary Deep dive submersibles
I can attest that the Canadian Arctic has plenty of interesting diving as well. Why not consider a really different vacation?
And really a bargain at $54,500.