There was this James Bond film, Die another day. Yeah, slack around, they'll wait for you.
And use 'replay chapter' option to get things you missed earlier :)
Subquests you want to do:

MILD SPOILERS

Arnold and Sylvester
Flower with no name
Nice try cooking
Another nice try cooking
Memorable cooking
Weasley's quests (for Passion Red)
Map to psychic Spot A
Snack for Willie (get all 7 obiects; don't leave them on the cementary)

http://www.gamefaqs.com/boards/943397-/57233475

I post you the solution directly, because almost all side-quests in thise game are time-oriented, and if you don't want spend a LOT of time just trying in witch tim you can perform an action, just use a guide to complete them all. But make the radio quest as soon as you can, because you will gain a lot of time using this.

I think the Japanese are the only ones who ever actually "got" how to make horror games, or even thriller titles like DP.

The early Resident Evil and Silent Hill games, many of Japanese horror games from the PS2 era, they all "get" horror and know how to make it work in a character-driven story, as well as integrating it within gameplay.