Do you want a "recovery workout" or do you want to give your body real time to just rest and get a BREAK? Take some time off from the gym, period. You won't implode.
I don't like hearing that you feel you're over training, yet want to fix that by coming up with a workout or cardiovascular session to rectify it.
People make mountains into molehills when it comes to talking about taking a week or so off. It's absolutely ridiculous. Then again, trouble is most people who frequent the gym wouldn't know a thing about linear progression in strength and/or muscle gains anyway so I'm not surprised.
Anyone can take a couple days off, or do a week or so of light workouts (they could help, but are not going to save you from anything you'd see from skipping them all together), and still feel okay. Times like this I liken to when folks say getting ripped is easy (yet barely weigh 170), getting big is easy (don't even have 16" arms, 44" chest, 23" leg), gaining Strength is easy (how much have you added to your lifts this year?), and so on. Point is, the people always making gains understand that a step back allows for more forward. Just look at all the people in the gym who always look the same. That's another tangent I could go on, but if they all knew what they had to do for the gains they wanted they wouldn't look the same perpetually.
Now, I say this coming from a bodybuilding background where if you're not burning fat or building muscle you're trying to even out one muscle here, one muscle there for symmetry purposes. If it's not one thing it's another, and the entire point is literally SEEING progress. If you're not THAT into it and just feel tired, that's cool! If you don't want to really get much leaner, bigger, stronger etc. That's cool too. The less you want to change your body the less important proper, adequate rest is. You can still rejuvenate without "going overboard" on rest and seemingly sabotaging everything in your mind. But, I still and always do recommend doing so. In for a penny, in for a dollar, be ecstatic with 75 cents worth of progress.