Recurring Date night ideas for middle-aged married couples?

JerseyFrank thought this was worth mentioning said

I’m looking for ideas to bring a little fun back into married life. I live near a major city (ok, ok… it’s just Philadelphia). I want some things we can do regularly, but without a long commitment - our lives are already pretty busy. I don’t want to (only) go out for a meal. Learning a hobby together would be fine, but with a small number of real classes/training would be best. Ideas for one-off dates are welcome, but are less valuable to me.