I would definately peel it - if you like celery, tomato, and feta cheese you can do this:
Equal parts diced or chopped cucumber, tomato, and celery. As much feta as you like.
chopped oregano
chopped basil (optional)
fresh lemon
1 clove garlic minced
salt and pepper to taste
EVOO
s & p
You want enough dressing to toss with and flavor the ingredients well.