sight‧see‧ing /ˈsaɪtˌsiːɪŋ/ noun [uncountable]
when you visit famous or interesting places, especially as tourists:
She swam and sunbathed, went sightseeing, and relaxed.

[TahlilGaran] Dictionary of Contemporary English ▲

sightseeing
noun
VERB + SIGHTSEEING do, go We did some sightseeing in the morning. It's too hot to go sightseeing.
SIGHTSEEING + NOUN excursion, tour, trip

[TahlilGaran] Collocations Dictionary ▲

sightseeing
noun
1.
BAD: After lunch we went for sightseeing.
GOOD: After lunch we went sightseeing.
BAD: They wanted me to take them for sightseeing.
GOOD: They wanted me to take them sightseeing.

Usage Note:
go sightseeing, take sb sightseeing, etc (WITHOUT for ): 'Today we're just relaxing by the pool and tomorrow we're going sightseeing.'

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2.
BAD: We're going to do a sightseeing tomorrow.
GOOD: We're going (to do some) sightseeing tomorrow.

Usage Note:
Sightseeing is an uncountable noun: 'Some people aren't interested in sightseeing.'

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3.
BAD: We visited all the famous sightseeing places.
GOOD: We saw all the famous sights.
BAD: Nagasaki is famous for its sightseeing spots.
GOOD: Nagasaki is famous for its tourist attractions.

Usage Note:
To refer to places that tourists like to visit, use sights (plural) or tourist attraction/spot (NOT sightseeing place/spot ): 'I've always wanted to see the sights of London.'

[TahlilGaran] Dictionary of Common Errors ▲