Through a case study of three educational youth exchanges from London to the Caribbean island of Grenada in the early 1980s, this paper situates decolonisation as a site for youthful agency. Assessing official and ephemeral exchange material held in archives in London and the Caribbean alongside original oral history interviews with key actors, the paper argues that an analysis of youth exchanges as informal education spaces helps bring into focus young people’s agency in decolonisation both as a historical process and conceptual undoing. While the paper asserts that exchanging produced transformative moments of becoming in which young people’s global educational encounters transcended local perceptions of race, it also reveals youth exchanging to a revolutionary nation was no holiday, and that “youth exchange geographies” were governed, predetermined and impeded by the organisational labour of youth workers, fundraising initiatives, and unfolding international politics.