I'll add yet another recommendation for B10 Night's Dark Terror. And yes, it does work best if you use its setting rather than trying to make it fit elsewhere.
Also N1 Against the Cult of the Reptile God, B7 Rahaisia, and the U1-3 series. And UK4 When a Star Falls.
I can vouch for all of these but the last, which I don't own. I ran B7 and B10 back in the day. B10 fits great if you use the Gazetteer GAZ1 Grand Duchy of Karameikos (not surprising considering the Gazetteer pulled much of its information from the adventure). I bought N1 and U1-3 recently U1 is dynamite and easily one of the most fun 1st level adventures I've ever read or run. U2 is... not as good. But U1 is good, clean fun!