Prepare the fruit and veggies: A small mini seedless watermelon will provide enough watermelon for the salad. Slice the watermelon into 1 inch rounds and then cut in to cubes removing the rind. Slice 1 large English cucumber in to thin rounds. Slice the strawberries removing the stem. Remove the seeds and stem from the jalapeno if using and slice.
Combine all the produce in a large salad bowl and stir.
Slice the basil into thin shreds by layering the basil leaves on top of one another and then rolling the leaves from top to bottom. Slice along the rolled up leaves and add to the salad bowl.
In a small bowl, juice the lime and whisk together the lime juice, agave (or honey) and salt. Pour on top of contents of the salad bowl and stir together.
Serve immediately or store in the fridge until you're ready to enjoy.