Being a fine day I went to the seahore
if there is any mistake please correct it
You are not a fine day, Ganesh. It should read:
Since it was a fine day, I went to the seashore.
Consider another option:
It being a fine day, I went to the seashore.
‘It being a fine day’ is a so-called absolute nominative participial construction. Such a construction has a subject of its own which is different from the subject of the sentence. The predicate is expressed by a participle instead of a finite verb-form.