Yes, DESTINATION is a Scrabble word!

Letter values in Scrabble US: D 2, E 1, S 1, T 1, I 1, N 1, A 1, T 1, I 1, O 1, N 1.

Is it a valid word?

DESTINATION is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

the place designated as the end (as of a race or journey)
the ultimate goal for which something is done
written directions for finding some location; written on letters or packages that are to be delivered to that location

Also: name and address.