[quote=ImANargleHunter]
I read Blood of Olympus today.

I really liked it.

......

I've got that weird surreal feeling that always accompanies the end of a series. Where can I possibly go from here?
[/quote]

There's no shame in liking Rick Riordan's work, he's a pretty entertaining writer of young adult fiction. As for where to go: onto bigger and better things. There's always another series. Try Neil Gaiman's American Gods, it's supposed to be excellent.