In a small bowl, mash avocado, lemon juice, salt/pepper, and thyme with a fork.
Add in pepitas, dried cherries, and tuna. Mix gently if you want your tuna to stay chunky.
Wash and cut the mini cucumbers in half length-wise. With a small spoon (I used my babies spoon - don't tell her!) scoop out a small amount of the middle of the cucumber so your tuna will nestle down inside. If using a larger seedless cucumber cut into 4-5 inch long segments. You will need 4 total.
Fill each cucumber boat with 1/4 of the salad. If you have some leftover, it's amazing on tortilla chips too.