I know you can visit some theme parks at certain times of year to avoid many children, however what I mean are theme parks built more for imaginative and fun-loving adults.
Take some of the park rides you might find in family theme parks that appeal to both adults and children, but instead of avoiding elements that may confuse/frighten children, they’re allowed to get more detailed or whatever may be more fun for people. Fwiw I’m aware of some smaller scale themed venues (particularly some horror-related ones), but I feel like I’m blanking on any obvious larger scale ones.
Omega mart in Las Vegas might come close?
Can’t think of large scale ones unless you include the rest of Las Vegas.
Busch Gardens if you want a theme park that’s also a zoo and botanical garden and has a lot of alcohol because its purpose is to advertise Anhauser Busch beers.
EDIT: Kids are allowed, but the alcoholic attractions are designed for adults.
Strip clubs?
Universal does Halloween horror nights that is very adult oriented. It’s in their normal park but they are open a standalone Halloween themed park in las Vegas soon that will be similar but full time.