[allendoerfer]

I second this, because you will have a goal to work towards and something measurable afterwards. If you are not really inspired, many other suggestions might be harder to really follow through on, so you might end up with having done nothing in the end.

By all means, do relax, but I‘ve often found it hard to do so, when you are sort of required to do something but actually just waiting. I have often found those situations to be more taxing than actually working.