I love aqua exercise. We sadly get to the pool in the next town about once a week. I'd love for it to be more but the evening and weekend hours are highly competitive with all the local swim teams.
Have you ever tried water running? There are lots of great toning exercises for the water too if you want to branch out beyond swimming. We are fortunate to have a deep water dive well that is also used for exercise. It is wonderful for running and other types of exercise. They don't allow lap swimming in the dive well it is just for exercise when not in use by the dive teams or scuba.
You can do water running in any pool and many of the other exercises as well. I suspect there are videos online if you decide you are interested.