I'm doing the same with mine.
Off lead exercise in the morning and at lunch time (that I sometimes switch for a long walk if I'm in the office with him), and a quiet quick evening walk to unwind + mental activities before he crashes on the sofa for the evening (which is bliss, he's only 14 month old so I still have very vivid memories of him being a dick in the evening)
At the weekend, we have a long off lead walk, and if it's a VERY LONG one, we may even skip the park altogether the next day and just have short walks. I always made a point that I needed to be able to NOT exercise him some days (in case of heatwave, injury, this kind of stuff)
I have a light collar but honestly, despite being in London, I really find my local park totally unusable at night, and a bit creepy. It's pitch black there. Maybe I should stop listening to horror podcasts.
Like a PP, I've noticed that the park is getting quite empty now, I wonder where are the dogs that I used to see everyday when the weather was good!