How to delete all pictures from iPhone but get them back on?

This might be a dumb question but I need to know the answer quickly.
I'm going to NYC for vacation on Tuesday and I know I will be taking plenty of pictures. My phone keeps saying that my iCloud storage is almost used up and last time this happened, it stopped letting me take pictures.
So, I'm wondering if there's anyway to sync my pictures to my computer then clear the iPhone just for my trip and then come back home and sync all my New York pictures to my computer and then get all my old pictures back on my phone?

Yea hook it up to iTunes then go to my computer iPhone and all your pics are there transfer then to your computer then delete them all of your iPhone and your all set to go if you want your old pics back just paste them into your Iphone

Yes, use real player. When you plug a usb device like a phone into your computer real player will detect it and copy and of the new data (pictues and videos) to your real player library (just make sure you check that every thing is copied or manually copy it before you start deleting things). Now when you want to put the pictures back onto your phone it is just like adding brand new pictures or a videos you downloaded (ps. Real player can download youtube videos and videos from sites for free). Just use real player (I think all you do it checkmark the pictures you want on your phone and click ''copy to'' since its an ''i'' device it should be easy as real player should recognize it and/or you can use presets for you phone on real player to make it an easier process.
Real player is a free download, you do not need premium.
You can also just use your computers document folder, etc.
Have fun in the big apple!

You can download Dropbox and when you take pictures it will go to Dropbox instead of iCloud if iCloud is full.