How about looking at KeepRight and correcting anomalies in your area?
Open KeepRight http://keepright.ipax.at/report_map.php and zoom in to your local area (or further away if you need a reason to visit somewhere different). See all those little coloured lightning flashes? They need to be checked and the map updated. Click on any flash to get detailed information about the problem.
You can select specific types of 'errors' by checking/unchecking the boxes to the left of the map. Some particularly useful corrections are:- 1. "Highway=road" Can you update the classification of this highway? 2. "Almost junctions" Do they actually connect? 3. "Floating islands/ways not connected to the rest of the map" Are there connections or do the ways really exist in isolation?
The points you are interested in can be exported as GPX waypoints for loading to your GPS unit by clicking on the 'blue GPX' at the very bottom left of the screen.
When you return after checking the sites do any required editing on OSM. A useful description of the editing could be something like "Correcting KeepRight alerts" with source shown as "Surveyed today" One final step (helpful though not essential) is to update the KeepRight page. Click on the flashes you have resolved and check the "ignore temporarily (error corrected)" box. That will place a smiley face on the flash and save other mappers from unnecessary work. KeepRight is updated roughly weekly so, even if you don't mark an error as having been resolved, the site will remove the error on the next scheduled update.