1Heat gas or charcoal grill. In large resealable food-storage plastic bag, mix lime peel, lime juice, garlic, tequila and salt; add shrimp. Seal bag, squeezing out air; turn to coat shrimp. Let stand 10 minutes to marinate. Drain shrimp; discard marinade.
2On each of 8 (12-inch) metal skewers, alternately thread shrimp, zucchini and bell pepper, leaving 1/4-inch space between each piece. Brush with 1 tablespoon oil.
3Carefully brush grill rack with additional oil. Place kabobs on grill over medium-high heat. Cover grill; cook 5 to 6 minutes, turning once, until shrimp are pink and vegetables are crisp-tender.