DItto what SK said. Racquetball is probably great cross-training (works a lot of different muscles, pounds on your bones to make them healthy, and helps w/agility and fast twitch muscle stuff), but it's not a recovery activity!

You also didn't say what your goals are. If you are happy riding at a comfortable pace three times a week, then it sounds like you have a great plan going. If you want to get faster, ride longer, do harder rides, then you need to alter your riding plan. But you didn't say that. Hard to give a suggestion when we don't know what the goal is.