This paper describes a collaborative longitudinal project, launched in September 2015, which aims to create a multilingual environment in a French Polynesian primary school called Maeha'a Nui situated in Tahiti. The project was conceived with the joint efforts of four researchers from the University of French Polynesia, and a number of teaching professionals involved in primary education. The overall objectives of the Maeha'a Nui project are: to involve all stake holders such as teachers, school staff, parents and so forth in the creation of a dynamic multilingual environment; to experiment and identify effective teaching methodologies for Content and Language Integrated Learning (CLIL); and to train teachers and colleague mentors on innovative techniques in foreign (English) and heritage (Tahitian) language teaching. The first part of this paper reviews the relevant literature on second and foreign language learning and bilingualism. The second part provides an overall description of the project and gives information on the procedures followed in the implementation of the project. The third section of the paper describes the CLIL research activities, which are carried out as a sub-project of the Maeha'a Nui project. This section also examines the preliminary data and describes the observations made as well as the pedagogical implications of these insights in language learning/teaching. The paper concludes with a brief description of what will follow.