Thanks for your reply!
To be honest, by my calculations I'd have roughly 10 months's worth of cash to live off, but I don't want to use it all. I want some of it eventually to go toward a big investment, and some to keep for when I end up in hot water not by my own choosing :)
As for a long vacation... I could possibly take a sabbatical, but I know that I wouldn't want to come back. I can't take any more days off as I've already used most of them, so it'd have to be a sabbatical.
The freelancing idea though, that's a goodun. I dunno where to start, to be honest, but it would be an interesting new experience.