Currently watching: The Godfather Part II. One of the greatest films ever, especially the slow, strung out endgame when Michael Corleone's own life falls apart, but still he goes out to get revenge on everyone who he feels wronged him. Classic.

I recognise Lake Tahoe; from the way the sun sets behind the mountains as they kill Fredo on the boat, it's clear the Corleone estate is on the Nevada side -makes sense.

What I don't recognise is Havana, now having been there

Having spent time there, its clear that either Coppola filmed it outside Cuba (on account of various embargoes), or the Castro regime restructured large parts of Havana after the film came out. Possibly both.