Patience, my young padawan. You'll have to give it longer than an hour and a half over the weekend for decent responses.
I don't have an index handy, but there was a decent 5th level adventure in Dungeon #90 called Prey for Tyrinth. Swamp Stomp in issue #93 was good, but aimed at 4th level. You could easily adapt it.
You could also try a Google search. I plugged in the search terms "Dungeon Magazine" and "5th level" and got several decent hits, mainly reviews of issues with appropriate level adventures.