2.开车从Detroit出境,估计星期日下午4,5点钟到加拿大口岸,2,3小时可否办完登陆手续?-- Yes.
拿到登陆纸后计划在加拿大住一晚,星期一办SIN#和银行存款,中午返回。不只是否够时间?-- No problem.
3.回来入关,如果问为啥去加拿大,可否直接回答登陆?-- Yes, I told the US border officer this fact. Actually they can know it even if you don't tell him because they will check your passport carefully.
Good Luck!