Tropical Seafood Kebabs Recipe

Name: Tropical Seafood Kebabs Recipe
Ingredients: 1/3 cup pineapple juice; 1/4 cup lemon juice; 1/4 cup orange juice; 1 tbsp soy sauce; 2 tbsp olive oil; 2 tbsp brown sugar; 2 tsp grated orange rind; 1/2 tsp ground cinnamon; 1/4 tsp cayenne , to taste (optional); 1 lb large raw shrimp, peeled and de-veined; 1/2 lb sea scallops; 1 cup melon, chunks or balls ( honeydew , cantelope , etc); 1 cup pineapple chunk; 1 large ripe avocado, peeled, seeded and chunked; bamboo skewer