Peel papaya; cut in half lengthwise. Remove seeds; coarsely chop papaya. Measure 1 1/4 cups. In a food processor or blender combine the chopped papaya, honey, lime peel, lime juice, canola oil, chili powder, and salt. Cover; process or blend until smooth. Transfer to a covered container; chill in the refrigerator for at least 30 minutes or up to 3 days.
To serve, in a very large bowl place spinach, strawberries, pineapple, peaches, grapes, blueberries, and pecans. Toss to combine. Drizzle with some of the dressing (about 1/2 cup). Toss to coat evenly. Pass remaining dressing.
Store any remaining dressing, covered, in the refrigerator for up to 3 days.