Do Thai massage places generally offer happy endings?
How does one ask without being offensive?

If they advertise on any sex-related site, you can ask without any offense.
If they are from an Asian country, i would guess 90%+ offers some xtras. Maybe just a HJ. But at least that. Chance of it being awkward is probably 5/100, if that high.

As you probably know, if you want more, just go completely nude on the plinth. Some wont even bother covering you when entering the room. Others may half heartedly cover you. If the latter, she will accidentally touch you. Indicate you like it with soft moans or wiggling and i am pretty sure she will soon ask where else you need massage. :-)

In my experience, all of them offer it.

Also, as with everything in life: if you don't ask, you'll never get.

Just ask. The yhai.massage place i go signature move is when the ask ypu to turn around they start playing with your junk and ask if you want the special.

I have never taken them up as a hand job would just leave me frustrated.

..if they advertise here...your ending would be happy...no question.

If you still not convinced..when you call to book ask " any extras with the massage?"
Answers :
1. "We can talk in the room" = yes...meaning =Bring a fat wallet with your wad...you going the distance.
2. " only Hand Relief "
3. "What did you want" = Bingo!...FH

This is my go to if I want a relaxing proper massage.

I would say most thai places offer a happy ending. There are usually a few tell tale signs hidden in the room too.

Can anyone share what some of the tell-tale signs in the massage room might be?
I haven't noticed anything so far in the rooms, that I would associate with happy endings.
I've found that the strictly therapeutic massage places all have tissues, for example, so that's not unique to HE places.

When it comes to the establishment overall, the only common tells I've noticed are that the windows are opaque, you can't see into the reception area from outside, and the interior passages are dimly lit.

Come to think of it... There was one "clue" I've seen. A place that's been operating for many years, which has wall-to-wall carpeting, seems to have a wide ring of what could be dried semen, staining the carpet all around each of the massage tables. (I prefer not to go there anymore, lol.)

Come to think of it, another tell in the massage room could be that it's dirty, or just hasn't been dusted in months.

Most of the sensual massage places I've gone to are spotless, but all of the dirty/dusty places I've been to have offered extras. I don't think a regular massage customer would tolerate the room being dirty, once they have noticed.

Is there a recommended place in Knysna?

...you guys are overthinking it now...all will handle your junk,one way or the other,if they advertise here.