I've been doing the Fkk scene for years, was shown the ropes by a buddy years back and have done the trips solo after he retired from the hobby. There are clubs all over the country as can be seen by
this google map. The blue points on the map refer to the fkk and sauna club clubs. I prefer the Frankfurt scene, but have done many trips to Dusseldorf and Cologne...also did several smaller clubs a bit farther north. Most of the clubs up north close at 1am though and I prefer clubs that close around 4am so I can have more time to rest between girls. Don't waste your money with any tours, for $100 bucks you can buy yourself a gps with europe maps and add the clubs to the gps at home before your trip. Occasionally a club isn't where the gps takes you, so print a map of the club and compare it to the clubs website directions. Another bit of advice is to find a side street near the club and enter that in your gps, give yourself some options if for some reason you can't find the club right away.
Bank machines that work with oversea's accounts used to be hard to find when I first started, but that's not been the case much lately. Try to use a bank machine with 'international' on the sign. The transactions fee's will add up fast...so if you plan on doing some sightseeing I suggest getting a charles schwab debit card, they refund any fee's other banks charge. Same goes with credit cards...a capital one card won't charge you any foreign transaction fee's.
Hotels...I found
booking.de to be one of the easiest websites to use. It also allows for easy modifications to reservations as well. You can also use google maps to search for smaller family run hotels...just type in a zip code and 'hotel' and hit enter. Problem with using family run hotels, sometimes they don't answer their emails for a week...and ive had it happen where nobody is around when im trying to check in. the plus is they give you a huge breakfast for the price of the room usually...but sometimes its safer timewise to use a larger hotel.
You don't need to speak German in order to visit the clubs, most of the girls speak some english...and the Romanians and Bulgarian girls are usually required in school to take English and are proficient. Remember now just because a girl says something to you in english, this doesn't mean she understands everything you say to her. She might have memorized a few lines from her friends and/or can't figure out your slang. So speak slowly and precise.
Knowing the rates of the clubs...if you don't know the rates, ask the front desk. And no tipping please. If you like the girl, see her again. Tipping is an american custom so don't do it oversea's. Its also good to buy a cheap watch to keep track of the time, one that if broken won't break the bank. You have agreed to a session if the girl puts her mouth on your johnson, some girls might also view kissing as an agreement. You want to have fun but try to avoid paying 100 euro's for 32 minutes of fun. If a girl tries to overcharge you, always suggest taking it to the front desk. Most girls will back down if your in the right when you say this...except at Palace. Most palace girls will try to upcharge you, tell you your time is almost up at the 15 minute mark...and the management will always side with the girl. Be warned if you plan on visiting this place. And remember the extra's cost...cim and anal are always extra, same is usually true with cumming on the girls body (there are exceptions though).
Renting a car vs. public transportation? If your staying in Frankfurt and plan on hitting either Palace, Mainhatten or the RLD then you don't need a car. You can manage Oase and World with public transportation/taxi's but if time is limited its easier to rent a car for the day. Clubs in Frankfurt close pretty late (4~5am)...so if you have an early morning flight and rented a car to visit a club its pretty easy to close down the club and head back to the airport, avoid the hotel fee (use it on a girl of your choice).