Hi,
Re downtime at Safari Plains then in the original review I was there in November which is the start of the SA summer but as you say June/July/August are their winter months. A quick "Google" (other search engines are available) gives as at today, 13 June, a South Africa sunrise circa 7.00am and a sunset circa 5.30pm. Their winter days will be shorter than when I was there and I am guessing that drive times may well vary at different times of year. Perhaps someone on a our summer / their winter trip can offer timings for that time of year.
I would imagine it would be too cold for the pool and whilst we used to hang out by the pool there is also a large indoor communal lounge and bar area where people can socialise.
I prefer a physical book and I only used wi-fi in the tent for e-mails, news and a bit of social media. As mentioned there is no TV/radio in the tents so bring your own entertainment. If wi-fi is not good enough in the tent for downloads then I am sure there is better reception in the main building.
Of course if early starts are not your thing there is always the opportunity for a nap!
It is a brilliant trip.
Ian