I'm the weird guy who loves Water Hazard. Easily my favourite part of the game. Run the combine over with an airboat, break the scaffolds they are standing on, look at the goofy ragdolls. And I'm a bitch for sunsets.
"Follow Freeman" is the worst imo. I remember getting horribly lost there when I played HL2 as a kid. Same issue with Ravenholm - even when I play it now, but the vibe carries it.