Steve--
SAR's right, Mike H's site is great for that info, for Ontario most of all (since Mike is an Ontarian)...
I can't improve on Mike's directional info, but a couple suggestions off the top of my head:
*If you're crossing at Windsor either way, try to track down the Lancaster project there. FM212 was the last Lanc to remain pylon-mounted anywhere, until removal not too long ago from her perch in Jackson Park rose garden. She is slated for static restoration at Windsor airport. Also being built up in Windsor is a static Mosquito airframe based around the recovered remains of a postwar Arctic survey Mossie, plus the pine test shell from Glyn Powell's Mossie fuselage mold in NZ. And in Jackson Park, where the Lanc used to sit, there are now plastic Hurricane and Spitfire replicas.
*If you're into Naval history as well as Warbirds, Hamilton harbour is home to celebrated Royal Canadian Navy destroyer HMCS Haida.
*CFB Borden, north of Toronto near Barrie (via Dunlop St/Hwy#90), has an impressive base museum collection including a number of airframes, some of which are in the museum Air Annex...which is housed in a 1916 Belfast hangar, one of several still standing from the base's early days as a Royal Flying Corps school in World War I.
*Not too far from Trenton, on a small side street in the town of Campbellford, is Harold Carlaw's Memorial Military Museum, an offbeat but very interesting private collection including one of the oldest extant CF-100s and a Canso hull.
*At Picton, up the hill from the centre of town (Church Street, iirc) is what is now named Loch Sloy Business Park. No aircraft here, but a slow drive through the premises is a haunting experience: it's the completely intact RCAF Station Picton, fundamentally untouched since the end of World War II and the wind-down of the BCATP. Other old BCATP fields still sport a hangar or three...butStation Picton is all there, down to the last H-hut on the ground side. If you like places where time stands still, this one will give you the shivers.
*In Ottawa, try to visit the new Canadian War Museum as well. Very impressive building. Unfortunately the one WWII aircraft on show there, a rare Spitfire IIb, has been crammed up into the rafters where it can scarcely be looked at, never mind photographed...
*CAvM (formerly NAM) does indeed have a B-24 in storage in their new second hangar. Ex Indian AF and RAF GR.VIII/B-24L, in WWII RCAF marks. The storage hangar tour is an extra $4 (iirc) but worth it; they usually do two or three of those a day. CAvM's website probably shows the times. Besides the Lib, there are examples of Canso, Bolingbroke, Beaufighter, Hispano 1112, Mustang, Fairey Battle, et cetera, in storage.
*And if you happen to be in the Ottawa area on the first Saturday of the month...don't, whatever you do, miss a sidetrip across the Ottawa River down Highway 50 to Gatineau (Quebec) Executive Airport for Vintage Wings' open-house event. Mr Michael Potter's collection, and facility, are spectacular and the fleet is ever-growing, with Spitfire, Mustang, Swordfish, Hurricanes (yep, plural...) present and Corsair and P-40 yet to arrive.
*And hey...if you happen to return via a route south of Lake Ontario, and are passing along the New York Thruway on the July 13 (?) weekend, hop off at Batavia NY and head south on Rte 63 to Geneseo...the best Canadian airshow in the whole USA!

(That's facetious but not much...always a ton of Canuck participation at Gennie and a large proportion of the crowd is Canadian too.)
Also, if you might be passing through the Hamilton area in the week leading up to Geneseo, shoot me a PM: I've taken that week off work, might be able to meet up with you at CWH or TAM or somewhere...
Cheers
Steve T (from Airworthy Lanc Country)