Cut the fresh pineapple into small, bite-sized pieces.
Dice the English cucumber into small cubes or half-moon slices. If using Persian cucumbers instead, prepare them in the same manner.
Slice the red onion into thin pieces. If including the jalapeño, cut it into thin slices as well.
Roughly chop the cilantro leaves.
If using feta cheese, crumble it and reserve it separately until the salad is assembled.
Place the freshly squeezed lime juice, honey or maple syrup, olive oil, salt, ground black pepper, and optional crushed red pepper flakes in a small bowl.
Whisk thoroughly until the dressing appears smooth and the ingredients are evenly incorporated.
Add the prepared pineapple, cucumber, red onion, cilantro, and optional jalapeño to a large mixing bowl.
Toss gently until the ingredients are distributed evenly throughout the bowl.
Pour the prepared lime dressing evenly over the pineapple and cucumber mixture.
Gently toss the salad once more so that the dressing lightly coats all of the ingredients.
Scatter the optional crumbled feta cheese over the top.
For a colder salad with more integrated flavors, refrigerate the assembled mixture for 15–30 minutes before serving.
Just before serving, add a little additional cilantro or a fresh squeeze of lime juice, if desired.
Serve immediately for maximum crispness or enjoy chilled after the resting period.