Theme: A Walk in the Park - The various parks are in the central part of the theme entries.
36A. Manhattan landmark, and a hint to this puzzle's circles : CENTRAL PARK
17A. Bureau of Indian Affairs purview : TRIBAL LAND. Ball Park, no surprise there.
23A. 1989 handheld gadget release : NINTENDO GAMEBOY. Dog Park, watch your step.
50A. Mr. Wilson's bane : DENNIS THE MENACE. Theme Park, think of Gary.
57A. Polynesian-themed restaurant chain : TRADER VIC'S. RV Park, for when traveling in your recreational vehicle.
"Erin Go Bragh!" Argyle here with O'Burnikel. While it was a walk in the park for the most part, I almost was mugged in one spot. Perps to the rescue.
Across:
1. Device in a jogger's armband, maybe : iPOD
5. Off-mike comment : ASIDE
10. Deck swabbers : MOPS
14. Emperor with a bow : NERO
15. Language of 14-Across : LATIN
16. Mayberry kid : OPIE. Little Ronnie Howard.
19. Heating or cooling outlet : VENT
20. Nationality suffix : ESE
21. BB-shaped veggie : PEA
22. Pay attention to : MIND
29. "Magic Mike" actor Channing __ : TATUM. C.C., what aren't you telling us? (From C.C.: Santa, I clued it as [2012 People's Sexiest Man Alive].)
30. Disparaging : SNIDE
31. Have yet to pay : OWE
32. Prof's aides : TAs. (teaching assistant). They get mad if you call them teacher's assistant.
34. Stat for Madison Bumgarner : ERA. Nicknamed "MadBum", he has pitched for the Giants since 2009.
35. Chaplin of "Game of Thrones" : OONA
39. Word before drill or engine : FIRE
41. Clothes drier : AIR. A CSO to Lucina from last night's comments.
42. Fish-on-the-line sign : TUG. I expect to see some funny links, guys.
43. "__ knows?" : WHO
44. Gentle gaits : TROTS
46. Implicit : TACIT
53. Comparable : AKIN
54. Modern, in Berlin : NEU
55. Through : VIA
56. "__ go bragh!" : ERIN. We're all Irish today. (Right, Miss?) (From C.C.: I clued this as [Fox Sports host Andrews]. See what an attentive editor Rich is! By the way, Irish Miss, I did have to ask Boomer what Dagwood sandwich is. Holy smoke!)
61. Data unit : BYTE
62. Ready to hit : AT BAT
63. Event with specials : SALE
64. 1930s heavyweight champ Max : BAER
65. Oddballs : GEEKS
66. Mined materials : OREs
Down:
1. Sharply focused : INTENT
2. Empire conquered by Alexander the Great : PERSIA
3. "Murder on the __ Express" : ORIENT
4. Driver's lic. info : DOB. (date of birth)
5. "Midnight in Paris" writer/director Woody : ALLEN. (2011) Owen Wilson and Rachel McAdams.
6. Light lunches : SALADS
7. "Give __ rest!" : IT A
8. Racket : DIN
9. Come to a halt : END
10. "Philadelphia" or "Chicago," e.g. : MOVIE
11. Test type : OPEN BOOK
12. Force to make a commitment : PIN DOWN
13. Tennis match part : SET. (game, set, match)
18. Theoretical evolutionary link : APEMAN. As sung by the Kinks, Link.(3:41)
22. Bovary's title: Abbr. : MME. (Madame)
24. Helen Keller, to Anne Sullivan : TUTEE
25. In this world : ON EARTH
26. Young lady : GIRL
27. Alter to fit : ADAPT
28. Passing remark? : "YEA!"
33. Planetarium projections : STARS
35. Liver or kidney : ORGAN
36. Longtime newsman with the catchphrase "And that's the way it is" : CRONKITE
37. Prison uprising : RIOT
38. Filmmaker with a distinctive style : AUTEUR. A filmmaker whose personal influence and artistic control over a movie are so great that the filmmaker is regarded as the author of the movie.(AUTEUR is the French word for "author")
39. F on a DVD player, perhaps : FWD. "Forward"
40. Informal "Understood" : "I HEAR YA"
44. Sardine container : TIN
45. Writer/illustrator Maurice : SENDAK
47. Pricey hors d'oeuvre : CAVIAR
48. Spiky winter hanger : ICICLE. BEGONE!
49. Pokes fun at : TEASES
51. West Coast NFLer : NINER. (San Francisco 49ers)
52. Hooks up with : MEETS
56. Partner of flow : EBB
57. License plate : TAG
58. Postal worker's beat: Abbr. : RTE. (route)
59. Grandpa Simpson : ABE
60. Brandy bottle letters : VSO. (Very Superior Old) (Very Old, Abe Simpson)
Argyle