Puzzle

 ACROSS

  1 Downright

  6 Jungfrau and Matterhorn

 10 Fish with "sea" and "striped" varieties

 14 Major artery

 15 Stallion's heartthrob

 16 Improve the wording of, say

 17 The very best in miserable accommodations?

 19 "Fare ___ well!"

 20 Slithery fish

 21 Art collector's trunk?

 22 Right wrongs

 23 Long story

 24 Dance party headwear?

 26 Forest footways

 29 Soup utensil

 31 Fly

 33 Palindromic New Year

 34 Butte relative

 38 Nun who's a bread-winner?

 41 Banjo perch

 42 New Deal org. concerned with fair practices

 43 Choose

 44 Two pints

 46 Music festival shelters

 47 Unpleasant celebrity?

 51 Gets older

 53 Bit of hijinks

 54 Rind-removal device

 56 Mornings, for short

 59 Scallion cousin

 60 Place to buy part of a three-piece suit?

 62 Entice

 63 Song such as "Nessun dorma"

 64 Clamorous

 65 ___ class (cycling session)

 66 Kremlin inhabitant of old

 67 Notice

DOWN

  1 Book part

  2 Folk wisdom

  3 Risk territory next to Siberia

  4 Any of the 6-Across: Abbr.

  5 Lack of refinement

  6 Ethically lacking

  7 Loos, e.g.

  8 Purchase in advance

  9 French seasoning

 10 Hollywood legend Davis

 11 For a particular purpose

 12 Tuscan city

 13 Hard to climb

 18 Take more than one's share of

 22 "Hail," to Caesar

 23 Risk razor burn

 25 Chorus members

 26 Prepare to move

 27 Stratford's river

 28 Fork point

 30 One way to buy stock

 32 French boredom

 34 "And ___ to go before I sleep ..."

 35 Perfect place, if you don't mind the serpent

 36 Religious subgroup

 37 Painting, sculpture, etc.

 39 Astor's colleagues

 40 Old pros

 44 Home shopping channel

 45 Sauce for fried fish

 47 Niagara ___

 48 Surpass

 49 Origins of human life

 50 Compare

 52 Turquoise or tourmaline

 55 Continent that's also a name

 56 Related by blood

 57 Disorder

 58 Ophthalmologist's concern

 60 Vintner's container

 61 Deer species

Solution