What is the ruling on building hotels, clubs, swimming pools, and amusement parks, and what is the ruling on the money earned from them, given the presence of forbidden mixing, immodest display (tabarruj), unveiling (sufoor), and wearing inappropriate clothing?

Places dedicated to committing haram acts are not permissible to build. This differs from places not exclusively dedicated to haram, where the original ruling is that building them is not forbidden unless haram use predominantly overtakes their function. Thus, if the predominant benefit derived from the sold item is a forbidden one, then selling it is impermissible. This matter varies from place to place and from one environment to another. Therefore, the questioner should consider the place and environment to make a judgment on this.