Ask HN: Where are the best internships?

Heya HN, long time reader, first time writer here :)

I'm a CS student in my 3rd year in Scotland, trying to find a summer internship. I'm looking around for internships but I'd like some more opinions on what's the best approach.

Should I be aiming to get in with a huge tech company (IBM, Google, FB, etc...) or do those generally end up with you lost in a huge crowd? Similarly, should I aim for smaller, local tech companies, or will that just end up with me not working on anything substantial?

Finally, if any HNers have had a particularly good internship, would you mind sharing any tips? (Asking where you worked in particular seems rather shady)