Miramar

First of all I hesitated a bit because I saw many recent bad 1 star reviews. And its even said that the park has a bad reputation. But now I got to say that Miramar isn't really that bad. I really enjoyed my stay and had a positive experience.

Arriving:
The park is situated in a more rural area but easy accessible via highway. Parking is free. I advice to arrive early around 9:30am since it can get pretty packed. (+ check the school holidays) Right now reservations are not an option but its limited access only, so first come first served (check the website to see if its free). Honestly I'd have preferred a reservation system. Before entering you need a corona test or vaccine pass (German 3g rule) check in on their website via the QR code at the entrance and remember to check out after exiting. Tests are available at the park.
You can chose between the "Erlebnisbad" (water park), nude sauna area and Crystal therme. You can buy a ticket to one single area or combi. You also have a choice of 4h visit, whole day and evening visit.

The park:
The water park's slide complex is already an eye catcher with its colorful architecture. Inside after getting your wristband you go to the right to the changing rooms (men and women mixed). The wristband lets you open and close a locker of your choice (lockers are free, not like in US water parks). The showers as well as the changing rooms area are pretty clean and are spacy.
Entering the main water park you have a relaxation pool under a glass dome to the right and a restaurant area on the left (where you have to wear a mask). Also on the right you can get to an outdoor pool area and the extra costing sauna area. Continuing straight you have a wave pool with tropical theme and a beach like area. Inside the wave pool there is a rope going across to mark where the water gets deeper. Thought of it being a bit of a trap to make people trip. There is also a kiddie slide, kids area and whirl pool. From the wave pool area you can also access the slide complex

Slide complex:
The first slide tower is the one featuring the body slides Typhoon and Blizzard. From the outside the tower looks its designed by a pop artist and resembles a "Hundertwasser"-house. Inside, the tower looks like it needs renovation. The blizzard slide, formerly known as Grüner Hai and being the roughest/intense slide in Germany, is a very fast and now smoother slide but with a very abrupt end. It still happens that people hit their head or so at the end. The typoon is not as intense, but also fun and fast colorful bodyslide.

The second tower features the most slides. First there is the racing body slide Piranha, which one is very fast paced. The right Piranha side seemed more intense with faster paced direction changes to me. Then on the right is a tamer raft slide where you can slide all together without waiting. Very fun and colorful slide. Then on the further right there is the crazy single raft slide Splash with a covered bowl followed by a quarter pipe element (one of a kind section).
Continuing up the stairs you have the raft slide Twister: a colorful fast paced slide with a huge covered funnel/halfpipe at the end. The second slide at the top is the famous Hurricane loop trapdoor slide featuring two loops. A very thrilling slide with a long freefall (if you're below 55kg you might not make it though the loop and use the escape hatch).

The third and also smaller slide tower, which is accessible via a more industrial looking stairway, leads to two smaller/shorter slides: the pirate slide which goes straight down and a broad slide with a fun water curtain in the middle.
They don't have group raft slides in the park though, but I don't mind that.

Conclusion:
Miramar a very fun indoor water park. I'd say in the slide domain it has a better slide selection than Rulantica. They have some crazy and intense slides in this park. The slides are all operated by traffic lights, except the trapdoor slide which has a life guard at the start. Thought it was pretty weird for them to open Splash at 10:30 and the trapdoor slide randomly at 11:30.
The park is also a cool combi between action and relax, everyone finds its place to be in this park. Its clean and mostly well maintained. The staff is friendly and helps you out if you ask them something. They do certainly NOT cashgrab you, not like in most theme parks where everything costs extra (lockers, parking etc).
The park was like at half capacity and the slides just had 0-5min waits. For me the 4h Erlebnisbad ticket was enough since I was solo. Its a very fun and enjoyable half day experience. I might come back.
Slides: 5/5  Price: 5/5  Families:4/5   Pool complex: 5/5  Relax/wellness: 5/5  Staff: 4/5
Sanitary/safety: 3,5/5

Der Saunabereich ist sehr schön und weiträumig angelegt. Die zahlreichen Rutschen im Erlebnisbad sind nicht nur für Kinder aufregend. Auch der Thermalbereich ist nett.

Just got back fro Miramar. It was amazing! It was my first time at a nude spa. I was not nervous at all. The people did not seem strange...but very normal. There was old, young, men, women and children. No one stared. I was a little confused about where to keep my wallet and cell phone, but soon found it. They have a special safet locker. Then..when do you change or where...The first area is general locker room for swimmer with suites, then there was a private changing room, where you striped down and enter a co-ed shower. Then you go out into a several different pools and saunas. Those were very, however, I really enjoyed the lake area. You walk passed several hundred nude people all ages and shapes and sizes. Now you enter the lake area...The day I went it was a sunny day and kids were playing in the sand and having fun. You quickly forget that everyone is naked. :) It was my favorite place in Germany!