Here are the correct pairings based on historical figures and their contributions:
- Searched for the Fountain of Youth - Ponce de Leon
- Discovered the Mississippi River - De Soto
- Explored southwestern America for Spain - Coronado
- Established St. Augustine - Menendez
- Founded Santa Fe - Portola
- Began missions in Arizona - Father Kino
- Founded Spanish California - Portola
- Established San Diego - Father Serra
It looks like there might be a mismatch for some of the explorations and founding. For example, while Portola is often associated with early California missions, Father Serra is better known for his mission work in California. Please let me know if you need adjustments or further clarifications.