What to do...... after twisting an ankle

So I twisted my ankle about 2.5 weeks ago playing ultimate frisbee. What's sad is that I didn't even really roll it that badly, but it's still not completely healed after this long. Must be part of this 'getting older' thing. Anyways, since I couldn't run or bike right after having done it, I needed to find something else to do for cardio. It turns out that you don't forget how to swim after 2 years of not being in the pool. I've always known what swimming is the best cardio workout for me, it just happens that my gym pool is only 2 lanes, so only 4-6 people can fit in it. I've gone at 6am and 11pm and the pool has been full. Well, I've gotten in two swims so far, but my ankle is healed enough to run again.