Aliens and sea monsters are much more likely in my opinion than Bigfoot.

The deep seas and outer space are two vast unknowns for the most part.

I DON'T believe we are alone in outer space and I believe new species will be discovered at sea.
I believe new species of insects or small rodents will be discovered in the rainforest jungles as well.
Terrestrials as large as a large as Sasquatch, leave more evidence and the fact that they are supposedly in terrain that humans inhabit have me sticking to my guns on this one.

Tell you what Rich, I'll buy you dinner at the finest restaurant in Washington State while I dine on rotisseried crow if you can come up with undeniable evidence of Bigfoot.

Book it.