[Faceman]

apart from the XP in TotSC there's quite a bit in Baldur's Gate city itself.
Have you been to every wood area already. There's one with a herd of Basilisks that will give you quite an XP boost.
Also if you haven't been to the city yet there's still a big part of the game left, so don't despair if you haven't reached the cap yet there's plenty of time.