It's definitely a vacation feeling. But u also pay for it. The more u pay the better seats u get to lounge. We had the daybed for 76€ for the whole day. It was definitely nice. Until a big family of 10 peeps arrived at around 4pm. Since nobody checks who reserved what space, people come in the afternoon and choose an empty space which was reserved earlier by the people who have already left their whole day reservation. I don't have anything against u using that opportunity, but these people were loud, obnoxious and rude. All I am saying: now that u got the best seats in the house for probably 6€, don't ruin it for the rest who are trying to enjoy themselves.
Altogether this place is nice but expensive. U can bring food but not food that can ruin the seats, like u can bring sandwiches. U cannot bring ur own alcohol. At the daybeds u have the opportunity to order online so u don't even have to get up. Also one annoying thing was the airplanes since this place is in their landing lane. So u constantly hear the airplanes passing in closer than usual vicinity.
Very well organised, clean, loads of activities!
They cheapest adult ticket starts at €6, public transport is very accessible and cycling from Frankfurt is about 20km.
Would definitely recommend it for a fun day out!