And just like that — poof! Summer’s gone. Son of a …

GO
Hot Air Ballooning
What: Not-so-extreme sport, with Hudson Valley views and champagne.
Why: Your very own Around the World in Eighty Days adventure.
When: Anytime. But book before you go.
Where: Randall Airport, Middletown, NY (845-692-2556 or abovethecloudsinc.com).

HEAR
End of Summer Music Celebration
What: Barra Libre blends punk, Latin, and world beats for one crazy party.
Why: Been sweating anyway. Might as well dance.
When: Fri. at 11 p.m.
Where: The Delancey, 168 Delancey St., b/t Clinton and Attorney Sts. (212-254-9920).

EAT
Heirloom Tomato Tasting Menu
What: Five courses starring summer’s favorite nonpartisan foodstuff. (A vegetable? A fruit?)
Why: Your fire-escape garden plan never quite panned out.
When: Thurs-Fri. 5:30 p.m.-10:30 p.m.
Where: Bayard’s, 1 Hanover Sq., b/t Pearl and Stone Sts. (212-514-9454).

BUY
Design Within Reach Sample Sale
What: Chairs, lighting, tables, and other furniture are up to 70 percent off.
Why: This stuff never goes on sale.
When: Fri. & Sat. 11 a.m.-7 p.m., Sun. noon-6 p.m.
Where: DWR Brooklyn Heights Studio, 76 Montague St., b/t Hicks St. and the Promenade (718-643-1015).

Azaleas Summer Clearance Sale
What: Adorable underthings from Princess Tam Tam, Love Tanjane, Zoe San Francisco, Woo, and Shopaholic at 20 to 70 percent off.
Why: Labor daze in something comfy.
When: Thurs. and Fri. 1 p.m.-8 p.m., Sat. noon-8 p.m., Sun. 1 p.m.-6 p.m.
Where: 223 E. 10th St., b/t First and Second Aves. (212-253-5484).