No, Sark as one of the Channel Islands is part of the common travel area which includes the UK, Ireland, IOM and the Channel Islands but Sark is not part of the EU.
Yes, you will need to show your passport.
Not unless you need a passport to visit Weymouth.
You need a passport to go anywhere.
No, but you will need a passport to get back into the US.
If you have the national passport (blue cover), you do not need a visa. Those Israelis who have a Travel Document in Lieu of National Passport (red cover) require visas.Source: http://www.cic.gc.ca/english/visit/visas.asp
No they just need a passport.:)
A Nigerian national who is living in, but is not a citizen of Poland, and does not have a Polish passport, will need to apply for a visa to visit the UK.
Yes, a Canadian needs a valid passport to visit England.
Yes a passport is required.
Yes
Yes you do
You need a Passport.