How to make my iPhone 4 battery last longer?

I'm going to Washington with my school for 3 days and we get back at the hotel at like 9:30 at night we're out all day so what do I do? In gonna wanna take a lot of pics and text my mom and stuff someone help!

Well first of all do you charge it alot or leave it over charging meaning do you let it charge for ling periods of time even if the battery is 100 percent don't do that

the longer and more frequently you charge your phone it starts to get used to it and you essentially kill your battery because it won't be able to retain as much charge

2nd do you have any apps which frequently stay running close them all limit internet use and texting and any music taking pics doesn't use that much battery

Iphone battery tips http://www.gatorspit.com/tips/iphone-battery-save.html