Trouble erasing photos from first-gen ipad

So my Dad got an iPad 2 and gave me his first iPad to take to University with me. I plugged it into my mac and clicked erase and sync.
So I have a folder of over 300 pictures I want to put on the ipad. I went to the photos tab in the ipad management screen in itunes and selected sync from folder, and I picked the folder. In itunes, it says 367 photos are to be synced. Then when I sync, only 33 are on there, and all of my dad's photos from before were still there too.
Since I never use iPhoto and have no photos in it, I decided to sync the ipad to iphoto, to try and erase all of it. Now in the photos tab in itunes it says 0 photos, yet when I sync, all of my dads old photos are still there.

Anyone able to offer any help?

Are you wanting to keep the apps your dad had on the iPad? If not, the best thing to do might be to reset the iPad. It's under Settings/General/Erase All Content and Settings. That would allow you to make the iPad 100% your own and return it to factory settings