I adore the Giants series and have run it several times, in whole or in part, starting in 1979 and most recently in a 5e campaign set in Sterich initially. It’s a blast, but maybe not for a limited time game.
I’d recommend Forge of Fury, which I DM-ed early in 3e. Great fun was had by all, except maybe the chainmail-clad barbarian who jumped into the subterranean river to escape the roper!
I’ve only ever played White Plume, back in around 1981, and remember it with both fondness and terror; a combination which is tough to achieve and speaks volumes for both the module and my DM from the time. Shout out, Simon if you ever read this forum.