I'd say this is my favorite holiday after Halloween! No you don't have to be Irish or like beer to celebrate it.
You can make the day fun by eating green food! Start your day off with green pancakes, waffles or green eggs by adding food coloring to the mix. For lunch you can have a cucumber tea sandwich and avocado deviled eggs. Then for dinner get some green pasta (the semolina mixed with spinach) or regular pasta with a pesto sauce and a side of asparagus, peas, or broccoli. For dessert  you can have green grapes, kiwis, and honeydew. For a fun cocktail mix midori with champagne for a shamrock cocktail.

I made Chalene Johnson's Greenberry Shakeology Shake recipe:

• 8 oz of almond milk
• 4 oz of water and ice
• splash of peppermint extract
• 1 tsp of peanut butter
• 2 tbsp of sugar free vanilla or cheesecake jello instant pudding mix
• packet of greenberry shakeology

Another recipe to try is the Shamrock smoothie:

1 cup almond milk, unsweetened
1 kiwi fruit, peeled and diced
¼ cup fresh mint leaves
1 tsp. pure maple syrup
1 scoop Greenberry Shakeology
1 cup ice cubes

Both recipes are a whole lot healthier than McDonalds Shamrock Shake, read what the ingredients are.