Also, got to be careful about the specifics of the non-resident license:
http://www.mnr.gov.on.ca/MNR/fishing/nonres.html - ran into this before. Do not buy a conservation license if you want to have a 5-bass limit ever - the creel limit on a conservation license is only 2 bass.
From the MNR web site above:
"Non-residents under 18 years of age may fish without a licence
if accompanied by a adult who has a recreational fishing licence. Any fish caught are part of the catch and possession limit of the adult who holds the licence. As another option, non-residents under 18 years may purchase a licence and any fish caught apply to the catch and possession limits of that licence."
It says the above on page 3 of the fishing guide too.
If you plan on fishing tournaments and/or plan on keeping your own creel of fish, you need your own license. If you will not be keeping any fish, then you may not need your own license.