Samuel isn't a common given name amongst Cameron's but there are references to a W. Cameron in PEI from the 1800 which "if" William was the eldest son could reference his father.
Scot's in PEI arrived there as former military personnel who opted to take advantage of some land grants following the colonial war; from the clearances in Scotland where crofters emigrated to Canada. So you could look at these records (Loyalist and Emigrant Ships) which are available online.
The other is the PEI BMD Database
http://www.gov.pe.ca/parosearch There is no birth of a Samuel Cameron but there are references under "Textual Items" which is where you will find W. Cameron and even a handful of S. Cameron's.
The other thing to remember there were a lot of Loyalists who arrived from the U.S. so you need to take that into consideration as the families place of origin.
Cameron is a very common surname throughout all of the British Isles so his family might not even be from Scotland.
Don