I went on my first Mediterranean cruise and made one mistake I still regret months later

• I recently embarked on my first European cruise through the Mediterranean Sea.
• Looking back, I wish I had booked more time on the continent before or after my voyage.
• An extended trip would have given me more time to explore, making the long flights worth it.

"What are you doing tomorrow?" A fellow passenger asked me on the last night of my first European cruise.

I was on a 7-day Mediterranean cruise on the luxury, adults-only Virgin Voyages cruise line. Starting and ending in Barcelona, I sailed to ports in Italy, France, and Spain last August.

"Flying home," I replied.

My fellow cruisers told me they'd be in Barcelona for a few more days to explore. Immediately, I realized what a mistake I made, especially as it was my first time visiting Spain.

While it never seemed like a must to extend my Caribbean cruise to spend more time sunbathing on additional beaches, I recognized that flying all the way to Europe from the US and not leaving time on either end of the cruise to see more of it was a missed opportunity.

I wished I had more time in Europe, and if I ever find myself on a Mediterranean cruise again, here's why I'll be sure to plan things differently.

I didn't have enough time to explore destinations

Although I'd never departed from an international port before, the Mediterranean cruise wasn't my first journey at sea.

In the past, I cruised on one other sailing in the Caribbean, which left out of Fort Lauderdale, Florida.

One thing I realized I love — and hate — about cruises from that experience is that port stops give me just a short preview of each destination. In every stop, I was allotted only a few short hours to explore, sometimes just a half day, and was left longing for more time.

This was especially true in Barcelona, where I boarded and disembarked my Mediterranean cruise.

I flew in the night before my voyage and the next day, went straight to the cruise terminal. And when we returned, I headed to the airport as soon as I got off the ship. I had no extra time to sightsee in the city I had never visited before or anywhere else in the surrounding area like Madrid or Montserrat Mountain, where I've always wanted to go.

Once I was on the cruise ship overlooking the city from my balcony, I saw a wide view of the landscape and was mesmerized by the architecture. I longed to see the magnificent, historic buildings up close.

"Next time," I thought.

An extended stay would make flying a long distance feel more worth — and it's better for the planet

I took a 7-hour red-eye flight to Barcelona from New York. On the way back, it was even longer with a layover.

Long-haul flights are taxing for me. I struggle with motion sickness and sitting still for long stretches of time. Additionally, flying can cause dehydration, a flight attendant previously told Business Insider.

So to me, more time in Europe would have made the long, difficult flight feel more worth the trip.

A longer stay also may have made my trip more sustainable. Flights made up 8% of transportation carbon emissions in 2021, according to the US Environmental Protection Agency.

And because of transportation carbon emissions, sustainable travel experts previously told BI that taking fewer, longer trips is better for the environment than shorter, more frequent trips.

In my case, I went to Europe twice in 2023. Combining those trips would have been more sustainable since I would have taken fewer flights.

If I could do it all again, I'd book a few extra vacation days in Barcelona to explore the fascinating European city on the front or back end of the cruise — or better yet, both.