But if you find yourself stuck for a (non-historical-fiction) story, or maybe a plot twist, definitely check out this idea generator: http://fictiongen.inky.me/
And if you're hoping for some inspiration on the mythology side of things, there's this handy-dandy illustration of ALL of Zeus' affairs and the resulting offspring, organized by author (and the period in which the author was writing!) which ought to give you PLENTY of fodder for conflicts and strained relationships!
Still not enough? Or not sure why Zeus and his various conquests did what they did? Here's 123 ideas for character flaws -- I am SURE you'll find at least ONE which explains his (mis)behavior... beyond the "I'm King of the Gods" excuse, of course.
Maybe your characters need some downtime -- or maybe you do, because the constantly torturing them business is wearing you thin -- don't forget, 5000 years ago, people totally played board games. I'm betting you can find some words if you have to make up the rules.
If all else fails, give IN THE TIME OF GODS by Dar Williams a listen -- an entire album all about the Olympians! Including a really interesting one about Hephaestus (it might be my favorite!)