0 to visit interesting places, especially when on holiday:
I haven't come here on vacation or to sightsee.
I was in Malasyia for work and didn't have much time to sightsee.
Their visits, however, were not sightseeing tours, but pilgrimages.
Each season brought at least 100-plus land-based adventure tourists as well as a steady rise in the number of sightseeing flights.
The event described by "go sightseeing" is unable to be described using a single verb "sightsee"; inflections like "sightsaw" and "sightseen" are ungrammatical.
Thousands of people visit daily, to shop, dine, sightsee and to enjoy the tropical climate of the city.