I think recent activity could sit as a small window at the right of the page, to make use of the empty space. Then you could click on it to the proper page itself.

But with most resolutions being wider these days, I don't think making the text space wider would hurt.

There's also a lot of hard to find links on this site. I think some should be removed though, like the GIP. It doesn't work, and there's an existing one that is likely more detailed.

An extended drop-down menu would be nice. Instead of having to click on the page to find the related link, there would be an arrow that shows the pages related to it. Would also make navigating easier.