The little old lady
I had had a hell of a week at work, hadn't prepared and could barely think straight.

So to slow the party down I had them meet a very old, very frail woman hobbling along the road. The 'good' characters of course stopped to talk with her, wondering what she was doing in the middle of nowhere and a little paranoid she was more than she seemed.
She explained (in a very slow round about way) she was on her way to visit her sister in the village several miles ahead. An hour or so passed as we roleplayed the journey with her commenting on every flaw she could see in the party, stopping to pee every half mile or so, refusing to get up on the only horse in the party to speed things along, and when finally she agreed to ride if the fighter sat behind her holding on, fouled herself, the saddle and the fighters groin.
The party, now frustrated and very annoyed, almost cheered when they spotted the village. The old lady directed them to a farm on the near side of the village where her sister lived. They arrive to find no sign of life. Suspicious, and thinking the DM was finally giving them an encounter worthy of their skills, the party stealthily prepare for combat and begin searching the area.
At this point, I wondered whether to continue with my plan knowing I was possibly going to get dice thrown at me. But, what the hell...
The party enter the farm house kitchen where they find a note from the sister to a farmhand saying she had set off to visit the old lady.