ir a + destination where the destination is a series

Question

If we wish to say:
I am going to .. and then list a series of places, is it necessary or unnecessary to repeat the a for each item in the series.

I am going to the airport, the hotel, and then the office.

Voy al aeropuerto, al hotel y, entonces, a la oficina.
Voy al aeropuerto, el hotel y, entonces, la oficina.

I'm voting for repeating the a for each item in the series, but since someone asked me whether it was necessary, I thought I might inquire of native speakers or better grammarians.

Answer 1

"Voy al aeropuerto, al hotel y a la oficina"
or
"Voy al aeropuerto, después al hotel y después a la oficina"
or as you said:
"Voy al aeropuerto, al hotel y, entonces, a la oficina"

Sadly or not you have to repeat the a for each item.

Answer 2

How do you know? These two always confuse me.

Heidita said:

entonces...you are looking for "luego"

>

Answer 3

entonces...you are looking for "luego"

Answer 4

Definitely "al hotel y a la oficina". The whole thing is a short for:

Voy al aeropuerto, voy al hotel, y entonces, voy a la oficina.