Good for you! We ride to do errands all the time. Every Saturday morning is the farmer's market and food co-op, sometimes Trader Joe's and/or the post office too. Recently I had to get my car inspected and had to leave it for an hour, so I just took my bike in the car and did a fun little bike ride while the car was being inspected (it was close to where I live, so I was familiar with the roads). Better than sitting and waiting in a grungy little gas station "reception" area!

My best "errand" ride ever was years ago. I had had to leave my Subaru Forester at the dealer overnight to have work done. My DH drove separately to take me back home. The next day, instead of doing the double driving thing again, I mapped out a route and rode my bike to go pick up my car. It was around 17 miles one way, as I recall, and towards the end, involved some challenging urban riding on busier roads than I like to ride on, but it went just fine, and I felt so empowered doing it!