Мне приятно гулять в парке вечером.

It is pleasant for me to walk in the park in the evening.

Breakdown of Мне приятно гулять в парке вечером.

• я: I
• парк: the park
• в: in
• гулять: to walk

Questions & Answers about Мне приятно гулять в парке вечером.

Why is it мне and not я at the beginning?

Мне is the dative form of я (I → to me/for me).

Russian often uses the dative to express feelings, states, or reactions that someone experiences:

• Мне холодно. – I am cold. (literally: To me it’s cold.)
• Ей скучно. – She is bored. (literally: To her it’s boring.)

In Мне приятно гулять…, the idea is It is pleasant to me to walk… → I find it pleasant to walk…

So the structure is Dative person + (adjective/adverb) to express how something feels to someone.

What exactly is приятно here? Is it an adjective or an adverb?

Приятно here is the short neuter form of the adjective приятный (pleasant).

Short-form adjectives are often used in predicative position (as part of the “it is X” pattern), especially in impersonal sentences:

• Мне приятно. – It is pleasant (for me).
• Ему грустно. – He feels sad.
• Нам интересно. – We find it interesting.

Grammatically, приятно agrees with an implied neuter subject это (it), which is usually omitted:

• (Это) приятно. – (It) is pleasant.

So it’s not an adverb in this sentence; it’s a short-form adjective used in an impersonal construction.