Post History

I believe [biking] and [bikes] should be synonymous indeed (or we can probably just remove one tag or the other). I don't think any deeper considerations were made when picking tags and a lot of them also appeared as part of post imports from Stack Exchange.

There is no obvious need to use tag hierarchies either, they are a neat feature but hardly mandatory. Although since this site has a very broad scope, it might not be such a bad idea to consider hierarchies starting at some main activity: biking, hiking, climbing, hunting, animals etc etc. This would help if we at some point want to split off a certain tag to a category of its own, if we find that the rules for posts below that tag might differ - animal/insect/place identification questions for example.