Coming from GB to Buffalo in December will feel like a heat wave, bring your golf clubs.
Mighty Taco, Ted's Hot Dogs, any bar that serves Beef 'n Weck, great pizza at non-national chains, Canadian strip clubs (I love when the girls say "do you want a lap dance and a blowjob" with that Canadian accent), Canadian Casinos, might as well check out the Falls its best from the Canadian side, find a Canadian beer outlet and check out the varieties of Canadian beer not sold in the US. You can bring 2 cases per person back with you. Get a Cuban cigar or two, its easy to bring a few across the border.