Questions & Answers about jīntiān gōngyuán lǐ rén hěn shǎo.
A helpful way to see it is:
今天 = today
公园里 = in the park
人 = people
很少 = few / not many
So the structure is basically:
time + place/topic + noun + adjective/comment
More naturally:
As for today, in the park, people are few.
This is a very common Mandarin pattern. Chinese often sets the scene first, then gives the comment.
今天 is a time word, and time words often come near the beginning of a Chinese sentence.
So 今天公园里人很少 sounds very natural:
Today, there are few people in the park.
You can also move time words in some cases, but putting them early is one of the most common patterns in Mandarin.
For example:
今天我很忙。 = Today I’m very busy.
明天他不来。 = Tomorrow he isn’t coming.