Some will offer and require a tour of the grounds. Some will require nudity on this tour while others will not. Some have world class resort accommodations, others are more rustic with most somewhere in between. Clubs usually charge a day use fee and an additional fee to stay overnight. The fee will depend on the nature of accommodations, number in party, number of days, etc.
Some clubs have a policy regarding admittance of single individuals either male or female.
Ask about the things that concern you and your situation. Naturally is published quarterly by Benn Loibel. Click the ad for more information. Going to a beach or hot spring is even easier. The World Guide suggests some protocols for nude beach users and you might want to review them.