Tourism requirements nowadays are adapted to the preferences of the guests and mechanisms of information and presentation of products within the tourist offer are designed in accordance with the rapid technological development. The new "Internet Generation" of guests is focusing their needs on a range of new activities that can be accomplished within selective forms of tourism. Selective forms of tourism in the world, as well as in the Republic of Croatia, are increasingly being developed in different domains of tourism, from sports, health to agritourism, where it appears in different offer packages, which include different activities. The marketing aspects of health tourism in Croatia are nowadays increasingly used as the basis of a good marketing plan and being presented within the marketing mix of various analyses of the shape and rich assortment of the tourism product itself, down to the determining and branding of the tourist destination. Agritourism as a selective form of tourism is developing in all parts of Croatia, and more and more marketing aspects are being applied here both within internet advertising and guest registrations, as well as through advertising on social networks. The specificity of agritourism also relates to the occurrence of the so called "circular guest" within the same destination and among the different providers of tourism and catering services. Although the marketing forms of selective tourism in Croatia are mainly related to the promotion of tourist offer, they are increasingly affecting the quality and competitiveness of the price of the product itself, which is most apparent within the health tourism form.