How about displaying Essential Add-ons at checkout like this or during agreement time?
On click information:
That’s done quite well.
I would ask to add “experiences” like nature walks, local tours, or whatever people dream up.
Hello!
We offer something similar on our confirm and pay form. You'll first want to add those optional surcharges to the account, making sure to give them a description and explanation to the guest of what they're for. More on how to set those up here: https://www.ownerrez.com/support/articles/optional-surcharge
Once optional surcharges have been configured in the account, guests should see the listed at the top of the confirm and pay form. It should list the ones that are available and the amount, along with the guest's explanation that was entered. If a guest selects to add one of those optional surcharges to their booking, the booking charges on the right-hand side under Price Details should be updated to reflect the add-on:
