Sorry, just saw this. We stayed a couple of times at Diana Residence and also Odyssey Residence, which is virtually next door to Blue Green. Diana R has some basic food items for sale and there is likely to be someone there to sell you stuff. Other than that (and Sunset Beach shop), there's two or three small supermarkets near the Dost Beach Hotel which are open quite late. It's a 5 minute walk. Although not really busy, the road leading to there is quite dark. I used to carry a cheap little led strip torch or keep my phone display on and point it at the cars when walking down when it was dark. That's probably overkill, but better safe than sorry.
It looks like hotels along that road were being developed last year so maybe they will put some street lighting at some point.
The alternative is if the dolmuses are still running, they go past the BG entrance - a one minute ride.
We had a friend staying at the BG and used the pool there some days. It's very pleasant and was pretty quiet and relaxing. As an aside, I thought the bar at BG was a bit pricey, foe example charging 9 for an efes last year (6 at Diana for comparison).
Also we did the Turkish night at the Dost Beach Hotel last year - the buffet and price was superb (I don't get into the entertainment so much but we escaped as it was starting.) I think they charged 25tl a head last year. Loads of really nice freshly cooked Turkish dishes.
The friendliest place around there is indeed Guven's - just a bit further on from the Dost Beach on the beach. They really look after you and one of the prime spots for the sunsets.
We really liked it up there. It's quieter and away from the hustle and bustle. If you want to go to the prom or Boris Marco, it's either pence on the dolmus, or almost as cheap for 3-4 in a taxi.