Before I started training people I was a competetive runner clocking up miles across the UK and abroad. I had the pleasure to meet some very nice people, see some great places, have fun and improve how I run. I would run everything, anywehere and I went through a phase where I would run half marathons and ran the distance for 3 consecutive Sundays. My Head Coach suggested that I should mix up my distances. He was right and this was some of the most valuable running advice that I have been given. To this day I consult him on any of my major running decisions.
Diversity is a good thing and mixing it up can make things a little or even a lot more interesting. It really depends on you and what you are willing to try and the time that you have to commit. Well whatever you do try to find something fun that compliments what you already do. Engaging in different activities can expose you to new techniques, challenges and learning opportunities. Some of what you learn can be applied to your focus and assist you with achieving you goals. My only word of caution is to be careful of sports that can lead to injury therefore slowing progress to your main goal. Most of all keep it fun, keep it safe and enjoy.