A lot to choose from:
-- Almost anything from Boat of Garten's back nine -- 11 and 14 are really good medium-length par 4s, 15 is all-world quirk, and 18 is a very good closer.
-- I really like Crail Balcomie's 5th and 6th holes, shoreline-hugging par 4s, one short and one long, and the 7th is a fun hole, similar to Prestwick's 1st, with an ancient wall lining the righrt-side fairway and a blind approach to a sunken green.
-- Shiskine's quirky par 3 twosome of #3 and #4 (one straight uphill, the other a drop-shot), plus the long, blind par 3 11th.
-- Traigh may have a higher ratio of fun holes per its nine holes than any course I've played; #'s 2, 4, 5, and 8 are quite good.
-- The 10th and 16th at Peterhead.
-- Several at Fraserburgh, but the 4th, a shortish par 4, stands out.
-- The 1st at the Eden, for the green alone.
-- Any of the ravine-crossing, clifftop-hugging holes at Stonehaven; 5 and 15 stand out for me.
-- The 13th, Clivet, at Royal Tarlair.
No one's mentioned the famous closing hole at the 9-hole course in Durness -- clifftop-to-clifftop. Peter Allis liked it.