I went on 2 of Royal Caribbean's largest and newest cruise ships. I enjoyed them, but they're not for everyone.

• I've sailed on Royal Caribbean's newest and largest cruise ships, Wonder of the Seas and Icon of the Seas.
• Both mega-ships are jam-packed with amenities, dining options, and people.

Before booking a vacation at sea, travelers should always research the best cruise line and ship for their needs.

If you're looking for an ultra-cheap and fast trip, try Margaritaville at Sea. Craving something more upscale? Consider Oceania Cruises.

And if you're looking for high-end sailing to unique destinations, I'd suggest avoiding Royal Caribbean's mega-ships.

Royal Caribbean has become synonymous with giant, family-friendly cruise ships

According to its current expansion plan, by 2028, about a third of Royal Caribbean's fleet will consist of mega-ships.

The latest addition, the 1,196-foot-long and 248,663-gross-ton Icon of the Seas, set sail in January, unseating its less than two-year-old predecessor, Wonder of the Seas, as the world's largest cruise liner.

Together, the two vessels can accommodate a whopping 19,238 people — 4,554 crew and 14,684 guests.

At almost all times of the year, these throngs of travelers can be seen running around the ships' eight neighborhoods, lining up for waterslides, and indulging at a combined 29 bars and 48 eateries.

I've attended complimentary sailings on Wonder and Icon, the longest being three nights on the latter. From their colorful pool decks to their inescapable crowds, as a solo adult traveler, I was equal parts entertained, overwhelmed, and overstimulated the entire time.

But admittedly, I had fun. I do love a good waterslide — and Wonder has three of them, while Icon has six.

If you plan on cruising with your children — and if they, like me, love activities like rock climbing and mini-golfing — Royal Caribbean's mega-ships could be your best option.

Its two largest and newest vessels are jam-packed with things to do. They each have more than 20 dining options and dozens of unique activities, a shortlist of which includes ice-skating rinks, ziplines, and shopping mall-like walkways.

But don't expect a peaceful retreat. The rowdy bar-hopping adults and screaming children at the water playground aren't exactly conducive to a relaxing vacation.

Mega-vessels might not be for you if you want a quiet, itinerary-focused cruise

If you want a relaxing and upscale vacation — maybe one that doesn't involve crowds of children — Royal Caribbean's behemoth vessels shouldn't be your top choice.

There are many ways to have a luxury vacation on Icon of the Seas. But unless you want to pay for upcharged amenities at every turn, you might be better off spending more upfront to reserve a more premium cruise line — especially if you're interested in cruising for the destinations, and not the ships.

After all, like most of Royal Caribbean's largest vessels, both Icon and Wonder are exclusively sailing in the Caribbeans.

Many desirable destinations like French Polynesia have set restrictions on cruises, including limits on ship size, amid concerns of pollution and overcrowding.

If stopping at these ports — or really anywhere outside the Caribbean — is at the top of your vacation wish list, you'll have to prioritize a smaller Royal Caribbean ship or go with higher-end companies like Oceania, Silversea, and Regent Seven Seas.

You might not get a waterpark, but at least you'll get a quieter vacation to destinations no mega-ship will likely ever be allowed to visit.