Theme: Land Ho! - Countries of the Northern Atlantic area.
68A. Country, and word that can be appended to the three-letter ending of 18-, 26-, 47- or 60-Across : LAND
18A. Hot-looking dude : STUD MUFFIN. Finland
26A. Unsavory-sounding Cajun side : DIRTY RICE. Iceland
47A. Taiwanese LPGA star who is the youngest golfer to win five major championships : YANI TSENG. England
60A. Nook Tablet rival : KINDLE FIRE. Ireland
Argyle here. Without the unifier, I doubt I would have made a connection. Getting the unifier first wasn't much help getting the entries, I imagine. But all together, a good puzzle. Four good columns, too. I liked the match up of AIR and ACE plus some STRIKES for Boomer.
Across:
1. Makeup or final : EXAM
5. Olympics segment : EVENT
10. Elaborate dance : BALL
14. Golf clinic topic : GRIP
15. "The Lincoln Lawyer" actress Marisa : TOMEI
16. With 41-Across, plant source of cosmetic additives : ALOE 41A. See 16-Across : VERA
17. Rowboat pair : OARS
20. GPS part: Abbr. : SYStem
21. Yeses in Congress : AYEs
22. Labor day arrival? : INFANT
23. Powerful engine : V-TEN. An inherently complex motor in limited use.
25. 650, to Augustus : DCL
31. Does a general's job : LEADS. I always heard they lead from the rear.
35. "Be that __ may ..." : AS IT
36. Work in the cockpit : AVIATE. Unless it's in the air, it doesn't make you an aviator.
38. __-de-sac : CUL
39. Maker of the Air Max athletic shoe : NIKE
40. Rich cake : TORTE. FYI - The difference between torte and cake. Link
42. Extremity sporting a ring, maybe : TOE. Did you get fooled thinking, "Extreme Sports"?
43. Lyricist Johnny : MERCER. He penned "Moon River" but earlier he did this.
44. "Terrible" ruler : IVAN
45. Come next : ENSUE
49. '60s militant campus gp. : SDS. (Students for a Democratic Society)
51. Fax button : SEND
52. Slacks measure : INSEAM
55. It's cut before dealing : DECK
58. Most like it hot : TUB. I'm a showerman myself.
62. Angler's artificial fly, e.g. : LURE
63. Monogram ltr. : INIT.ial
64. Yippies co-founder Hoffman : ABBIE
65. Major exporter of handmade carpets : IRAN
66. "What did I __ deserve this?" : DO TO
67. Takes a chance on : RISKS
Down:
1. Self-perceptions : EGOs
2. One of Superman's powers : X-RAY VISION
3. Bombing attacks : AIR STRIKES
4. AWOL pursuers : MPs. (Military Police)
5. Online marketplace for handmade goods : ETSY. Link
6. Cast a ballot : VOTE
7. Flightless birds : EMUs
8. Actor Beatty : NED
9. Like a mouse : TIMID
10. Confuse : BAFFLE
11. A, in radio code : ALFA
12. Pork cut : LOIN
13. Pre-Easter season : LENT
19. Ben or Sam : UNCLE
21. "__ luck?" : ANY
24. Suffix with kitchen : ETTE
26. "Inferno" poet : DANTE
27. Hourly charge : RATE
28. Old piano key material : IVORY
29. About, in dates : CIRCA
30. Moth-__: tattered : EATEN
32. Pet detective of film : ACE VENTURA. Portrayed by Jim Carrey.
33. "Hungry Like the Wolf" rockers : DURAN DURAN. [spoiler alert] Strange lyrics; I liked the song better before I read them.
34. "Hit the road" or "hit the books" : SLANG. Idiom, yes; slang, I'm not sure.
37. Actress Hatcher : TERI
41. Workbench clamp : VISE
43. Reward for a hero : MEDAL
46. At ease with : USED TO
48. "Shame on you!" : "TSK!"
50. Eyeliner problem : SMEAR
52. "Just joking" : "I KID"{
53. Boy, in Bogotá : NINO
54. Bad mood : SNIT
55. "That's mine!" : "DIBS!"
56. '70s-'80s heartthrob Estrada : ERIK. from TV's CHiPS.
57. So-so grades : CEEs
59. Curve in the road : BEND
61. G-man's org. : FBI
62. "__ Abner" : LI'L
Argyle