Eastern Canada has some pretty notorious tourist attractions in spring and early summer - black flies, mosquitoes and no-see-'ems. If you'll be camping skip any ideas about hammocks or simple tarp shelters. You'll need a fully enclosed tent with extremely fine mesh screening - not the typical screen door variety.

Rather that starting with a list of 'stuff' - I'd suggest you start with a detailed list of specific destinations and objectives and priorities. Then work backwards and figure out what you need to support those. You can check yourself against someone elses list - just don't assume YOU'LL need it cause its on someone elses list.