On his trip he confined himself to sightseeing and other -ties.

在旅行中他只限于观光和做一些无关痛痒的事。

The tourists went sightseeing in the suburbs of the city.

客们览了市郊。

We spent the afternoon sightseeing.

我们下午去观光了。

It should be protected as natural history relic and make the most of its values on geognosy and sightseeing resource.

应将其作为自然历史遗迹及时加以保护，并在保护的基础上充分发挥其地学旅资源价值。