Running

This is my rest week but finding it weird not doing anything at all.
For those that do a rest time do you still do your usual commutes on the bike ete... or do nothing at all ?

Being a rest week doesn't necessarily mean that you shouldn't be doing any training at all. Yes, reduce volume and intensity but keep doing gentle/short runs. If you really want to stay clear of running (for example if you want to give niggling injuries an opportunity to recuperate) then sure keep on cross training (swimming/cycling/whatever) but again keep it chilled out.