For really light (and I mean light) reading I'd go with the Forestwife trilogy by Theresa Tomlinson. It's a fantasy take on the Robin Hood story (don't be put off by the girly title - it is an adventure story). I studied it at Uni for a Robin Hood assignment and it was really enjoyable.
In a similar vein, have you read any Tamora Pierce? I'm looking into the dim and distant past of my teen-lit days but most of her stuff was set in a vaguely medieval world with highly fantastical elements. The series' I can remember are 'Song of the Lioness' and 'The Immortals'. Again, though, they are both a bit female-centric ('Lioness' more than 'Immortals')and aimed at teen readers (probably the same demographic as The Hunger Games).