Overall, above five tips are highly beneficial to communicate sustainability to all customers you want to make aware of the benefits of sustainable tourism, and who you want to convince to book their next trip with your organisation.
The exception to the rule here is if you have a target group that is already interested in sustainability and where it influences their buying behaviour. Here you can focus on rational communication including additional detailed information and specific details.
With this group of customers, you have passed the point where you encourage and raise awareness, as you now simply inform your (potential) customers about your sustainability performance. The end goal is to move all your customers towards this group.