I don't have experience with surveying with a bike, but wonder whether you are willing to stop and take notes each time you see something interesting. Perhaps you could install the Mapillary app on your phone and attach it to your bike. It will continuously take pictures of your ride. You upload the pictures when you are back home to their server. When the images are processed you can see them in iD and JOSM and use them to map all kinds of things. Other people use a video camera to collect data. I make walks and only take pictures of stuff that I want to map. But usually I do not take enough pictures (ca 300 pictures for a 2 hour walk of ca 12km). I use a DSRL [DSLR](//en.wikipedia.org/wiki/Digital_single-lens_reflex_camera) and attach long/lat to the pictures later on using the GPS track I recorded with my GPS device via the geotag application. Personally, I find my smartphone way to slow for taking pictures (also because I want to use it as navigation aid and switching between 2 apps takes forever).

I don't have experience with surveying with a bike, but wonder whether you are willing to stop and take notes each time you see something interesting. Perhaps you could install the Mapillary app on your phone and attach it to your bike. It will continuously take pictures of your ride. You upload the pictures when you are back home to their server. When the images are processed you can see them in iD and JOSM and use them to map all kinds of things. Other people use a video camera to collect data. I make walks and only take pictures of stuff that I want to map. But usually I do not take enough pictures (ca 300 pictures for a 2 hour walk of ca 12km). I use a DSRL and attach long/lat to the pictures later on using the GPS track I recorded with my GPS device via the geotag application. Personally, I find my smartphone way to slow for taking pictures (also because I want to use it as navigation aid and switching between 2 apps takes forever).