Honestly, I very rarely eat the snack between breakfast and lunch, because we eat breakfast so late, and have to have an early lunch because of DH's schedule. But I always have my in between lunch/dinner snack because there is a lot more time between.
Breakfast is super important. I also just make sure I have in my mind in the morning how I'm going to work the snacks. And maybe even deciding beforehand what you want to have...then you look forward to it.