Personally, when it comes to sports, I'm just out their, just due to ages, it's difficult to find sports clubs. But have you looked for Badminton clubs in your area? I also LOVE making aims for myself, for example, I've done the 5K race for life, and will be doing the 10K soon! And I've taken my time to prepare for that, many people walk the Race 4 Life, but it's such an amazing experience when you're done, and whether you come first or last, it doesn't really matter, because you did it and that's a massive achievement, hope for the best and expect the worst.
You also find walking quite thrilling by the sounds of things, do you walk to the shops and to work maybe (If you work)? We often find our selves stranded when it comes to cold weather though, but I say, wrap up warm and just go for it! You don't need to go to far! And times like this, are amazing to build snow men ;) (If you have snow like us) :P
Snow in March, really can't get better than that!