need advice on getting photos printed large/canvas

My brother has taken a photo (timer and tripod) while on his
honeymoon recently.  He really likes it and is intending to get
it enlarged and printed on canvas or something.  I really like it
too, it's pretty bloody good.

I've had a bit of an edit of it.  It's 3504x2336px full size, the
crops are smaller obviously.

I understand that photo quality prints are around 300ppi, or you
can increase the size of prints a little and may not lose too
much quality.

But I think he really wants this thing blown up, like 1 metre
wide or something.  I'm concerned it may come out pixelated or
something.  

Will it?

If so, can I scale the image up and do something so that it
doesn't print pixelated?  Maybe blur it slightly to take out
pixelation?

What max size would you recommend?  I think he just intends
hanging it on his wall, not an art gallery :)

Any other recommendations?

-- 
Troy Piggins
I always appreciate critique.