"Like a kid in a candy store” is an expression that means there are many wonderful choices/temptations for an individual. (A kid loves candy and a candy store has lots of it.) Citations for the expression begin from at least 1929.
The Free Dictionary
be like a kid in a candy store (American & Australian)
to be very happy and excited about the things around you, and often to react to them in a way which is silly and not controlled You should have seen him when they arrived. He was like a kid in a candy store.
like a kid in a candy store
A state of utter fascination, with many good or tempting things all around you.
In Amsterdam I was surrounded by weed, shrooms, pancakes, and cheap whores. I felt like a kid in a candy store.
by Nick D Nov 24, 2003
4 February 1908, San Jose (CA) Mercury News, pg. 7:
Science, which has been busy as a kid in a candy store in the past year, is about to prove that animal energy is developed by electricity and that the human body is a battery for generating the subtle fluid from the pure food products the person absorbs at a banquet, a free lunch counter or elsewhere.
2 January 1929, Montana Standard (Butte, MT), pg. 4, col. 3:
AMERICANISM: A rich man’s bride, flush for the first time in her life, spending money like a kid in a candy store.
2 September 1934, Seattle (WA) Daily Times, pg. 33:
He didn’t have any more sales resistance than a kid in a candy store.
20 December 1945, Abilene (TX) Reporter-News, “Bo Is Like Kid in Candy Store Now” by Whitney Martin, pg. 4, col. 7:
The little worry wart who gave the Hoosiers their first Big Ten championships in history was just like a kid told to help himself in a candy store at the New York World Telegram presentation dinner, a bewildered and incredulous individual going around mentally pinching himself to be sure it wasn’t all a dream.
22 October 1946, Chicago (IL) Tribune, pg. 22 ad:
But by the time I talked to him, after three weeks of treatment, he was as happy as a kid in a candy store.
Spinning for fresh water game fish
By Joseph D. Bates
Boston, MA: Little, Brown
I SOMETIMES WONDER whether or not a fisherman selecting lures in a tackle shop has more difficulty making decisions than a kid in a candy store.
By William P. McGivern
New York, NY: Dodd, Mead
“He’s lucky, a kid in a candy store, a sadist running wild in a concentration camp.”
6 April 1959, Rome (GA) News-Tribune, pg. 4, col. 7:
It shows that when a Russian goes West. the standard of living leaves him ike a kid in a candy store.
BRAZIL: The Gay Victim
Monday, Nov. 16, 1959
The future looked good, Birrell thought. “The big problem in Brazil is to select which opportunity you want to concentrate on. It’s like being a hungry kid in a candy store. You don’t know which box to pick from.”
1 July 1967, Billboard, pg. WS34, col. 3:
The cartridge buyer is a virtual “kid in a candy store.”