Some yet to be excited about island in national park (8)
I believe the answer is:
yosemite
'national park' is the definition.
(I've seen this before)
'some yet to be excited about island' is the wordplay.
'to be excited' indicates anagramming the letters.
'about' means one lot of letters goes inside another.
'island' becomes 'i' (geographical abbreviation).
'some'+'yet'='someyet'
'someyet' is an anagram of 'yosemte'.
'yosemte' placed around 'i' is 'YOSEMITE'.
'in' is the link.
(Other definitions for yosemite that I've seen before include "Where there are watery cascades" , "Natl. Park in California" , "California falls, valley, park" , "Californian national park" , "US National Park in California" .)