How to book an activity/service on your website ?

Use the search engine for each service: however, it is calibrated for overnight stays. Simply select :

date of arrival: the day of your desired activity (or the date on which you want it to begin) or the start date of your stay.
duration: if it's an activity that takes place over a stay: the number of nights you'll be staying, if it's a one-day activity: a single night.