I can't see how the AC in upper guk would be anywhere close to soloable at 24. The crocs are level 29-30ish and you wouldn't be able to land any spells. However, if you are looking to group, upper guk can be awesome experience if you can find a couple people there to hunt with.
At 19 for soloing, I was still killing undead gnolls and wolves in east karana on the gnoll hill. The 2 aviak spawns in Lake Rathe by the arena are also a decent option. You've got a zone line 20 feet away if you have any problems. Just root and rot them down.
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