A night-club bouncer, now a top official,

Put Coke or Pepsi in it; first three initial.

Combine all lakes; but I still have more,

Of all the places; I have the largest shore.

What am I?

Answer: Canada

Explanation:

The answer to this riddle is Canada:

"A night-club bouncer, now a top official" is a reference to Justin Trudeau, prime minister of Canada, who used to be a nightclub bouncer and a snowboarding teacher.

"Put Coke or Pepsi in it; first three initial" refers to the word "can", meaning both the container of Coke or Pepsi and the three first letters in "Canada".

"Combine all lakes, but I still have more" refers to the fact that Canada has more lakes than all the lakes in the world combined.

"Of all the places; I have the largest shore" refers to Canada having the longest coastline in the world.

I'm going to guess an ocean.