I spent one week in Gaza and another week between Ramallah and parts of Israel.
After the time there I still have contact with the friends I made there and try to contribute with any initiative they put together.
It also pushed me to look for local initiatives here in the US .
You can also donate to their current campaign to help create the coding academy, which I've also done, after seeing it in person I can personally say it's fantastic and students there told me how much it's changing their lives, making them more confident and hopeful about opportunities for their future.
Link is here: http://www.powerupgazageeks.com/