I've been going to such places for years and visit real spa's only when traveling. When I recently moved to another city, I bought single entries and tested all those places offering gym and spa in out to find one that fit me.
Found that the more expensive places have a lack of primitive people, and thus more females using the spa. But at times it is a men only event. Or just recently I went to the gym before a night out on a friday from 4pm, and since there were so many beautiful females, I decided to go for an Aufguss and indeed, one of the beauties that caught my eye when working out was there. (funny enough, those two beauties who were working out without bra did not show up in the Sauna).

Winter Experiences
 

How is Z in A on a winter weekend compared to summer weekends? Is it about the same amount of women for both?

You should at least state the country. Z in A or WW in B make no sense to me.

Smaller spas in Germany can be extreme sexy if you know exactly when to go there. But they can be a total turn down as well.
For tourists, going to a big place on weekends is simply the better approach, even if 180 of 200 ladies are boring you still have enough to enjoy.

Zuiv3r in Amst. How do the cold weekends compare to hot ones? I've never been during the winter

They are clearly Z in Amsterdam and W Waters in Brussels?

@lilslip33

I would say, the best day for me was Saturday at K in Ber. A lot of people, I would say 70% were permanently nude, just a towel in hand and thats it. I saw a lot of beautiful mums with their young kids, I sat next to them and they were laying next to me fully naked or standing in front of me full frontal and bending playing with their kids, bending next to me, squatting half a meter away and I had my dick in front of their face while relaxing on my chair. And the best and youngest girls were present on that day, but of course I have been there only for a long weekend, so I just share my small experience.

About Z in Amst, it is crazy how Dutch feel about nudity and especially girls. Usually you find a bigger percentage of women than men. And most of them are younger than 35. I think you can find more people during winter, BUT you can have better views in summer due to nude sunbathing. Dutch girls are very open minded, they never feel shy, you may sit alone in the sauna and 5 mins later a beautiful 25yo girl can enter and lay next to you with legs open. That happened to me numerous times. It is amazing and right now still my No1 place to be.

@kuzco1000

I have been there (W Wate** in Brusse**) only twice on weekdays, there were more old people, mostly women and some young couples. Some young chicks were there for the massage and they left without spending a lot of time in the spa. The place is really nice, I feel that it is better on summer because there is a very large outside area. The people I have seen were more modest than other places, always wrapped in towels. They looked at me in a strange way when I was walking fully naked from place to place.
I have read a lot about Boetfo** in Bru, its in a castle, they say that it is packed on weekends. I will be in the city for a weekend in November and I am thinking of visiting this, if somebody has any feedback it would be much appreciated. Would really like to know if there are any younger people.

@eclipsecz

Company plans changed and I will have to be in Poland, Warsaw once again next weekend. So I will visit once again those places I've been before, but I will write a small feedback about what I will see (Polish girls are really nice and I always have good stories to tell). Really try to go to Prague and every time the schedule is changing. I 've read so many good stories about Aq**Pal***, I have great expectations from the Czech girls, cant wait for this trip to happen

@redyg3

This Atlan*** place in Ljub**** is really nice. I have been during summer and also winter. The good thing with summer is that they have a "nudist beach". Actually a pool with lots of sunbeds around, that they are really really close, so when you lay nose down, you may have an open pussy in front of your eyes at 2 metres away. I had a lot of great experiences from there. There are normally a lot of old people, BUT you can find some solo girls, around 35-40 year old that they really love to get sun tan all over, and they spend the whole day if it is sunny under the sun.
Last time was this June, there was a very slim athletic girl with an oiled body, laying on the sunbed behind me. I stood up from time to time just to get a glance and when I was sure that she was asleep, I made my sunbed flat and turned around, I had her open tanned pussy full of sun oil in front of my eyes for nearly an hour. I got hard a dozen times. That was one of the best things that happened to me.

Suggestions for Heidelberg
 

Anyone have suggestions my wife and I in Heidelberg?

It is packed, but the spa itself isn't actually in the castle. It's mainly in the garden (and partially underground).
Which means that in winter (haven't been there in winter) I'm guessing it will be less crowded.
But in summer, there is a massive garden and tons of sunbeds. And during the day the average age is lower then what I experienced in other spa's in Belgium.

Many thanks that's a shame regarding WW in B

I was looking forward to seeing some groups of young girls.

Ive been to the castle one before and saw some great sights im tempted to change my booking