Congratulations on doing your first 5K.
You can do a 10k quite easily.
I think that taking a "forced" walk break is kinda silly.
You lose your momentum, you feel restrained, you're following some dogma instead of listening to your body.
The legions on a marathon doing this crack me up.
"OKAY. Beep. Walk."
"Beep. OKAY RUN!"
Over and over and over again.
Think about it...where does your car get more mpg...city or country? Why? because you you're not stopping?
Not to say I don't stop...I did a 33 miler last year and walked a bunch...Why? Because I was tired and needed a break.
I say listen to your body. But try to run the whole thing.
You'll get a ton of satisfaction from running your whole race.
Coach Gary Smith
http://www.socalrunning.com/