I've been loving the increased time I've been spending with board games lately.
The thing I'm enjoying the most is finding excitement in gaining a complete understanding of the underlying systems used by a game, but still being surprised by the depth and fun designers can have within a completely known system.
The Arkham Horror LCG has taken up quite a bit of my solo gaming time lately, and it's been a great example of what you can do with a set of interesting systems.