Merric's list of adventures is terrific.
Since somebody already mentioned
Malvern Manor, I'll note that I wrote a sequel as well. The much less appreciated
Journey Through Crocodile Crossroads was also a hit with my kids, though we didn't get quite as far into it before they all had to go to bed. Or, if you're just looking for a story starter, you can try
The Demon's True Name.
For what it's worth, I also ran
The Lost Mine of Phandelver for my kids, and we had a great time with it. In general, I prefer to make my stuff up as I go along, but there are a couple of quick, fun dungeon crawls in Phandelver that are really terrific.