Canadian Student- Summer Internships/Programs available to explore interests??

Hi everyone!

So I was just wondering what summer internships or programs are available for high school students. I’ve seen that many programs in the United States do not accept international students. There are Canadian programs like Shad Valley and such, but I was wondering what else is offered.

Lots of the programs also focus on math and science. What programs would you suggest for students who want to explore their interests a bit? I’m not too sure what I would like to do in the future, so I think that finding something interesting to do might help me explore some of my choices.

Thank you!

Are there any other programs like Shad Valley available for students?
Canadian or American or European programs?