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Understanding leisure travellers' transport mode choices is highly important for transport and environmental sustainability. This paper investigates leisure travellers' mode choices through a combination of mixed logit and latent class modelling. A total of 837 survey responses of leisure travellers were collected in Western Australia. Results suggest an outperformance of latent class model in terms of model fit and interpretation of travellers' taste preference heterogeneity. One cluster identified by the latent class model, with relatively high-income older travellers, was more sensitive to service-quality factors, whereas the lower income young travellers of the second cluster were more sensitive to travel cost. The findings provide practical insights for tackling transport-related challenges and their detrimental impacts on the environment. These findings can also assist public transport providers and policymakers to enhance its competitiveness and enforce low-carbon public transport for leisure travellers, therefore significantly reducing emissions from tourism transport to achieve sustainable development goals.