Start by explaining why you chose I2C as the communication interface between the two Arduinos. Why are you using two Arduinos? Has one a separate location far away? Does it make sense to let the receiving Arduino be the slave in the I2C communication?
You probably see that it's a good idea to tell us more about your project, we might help you to get the best way to transport that information between the Arduinos (or eliminate the need to have two of them).