People are different, is it really so difficult to understand?
My mum likes cruises. She's not 'elderly', she's 57. She's a glamorous woman in her daily life, groomed to the max, but doesn't have many occasions to show off her 'most-most' outfits, so a cruise is perfect for that. She's a drinker and likes a party, music, dancing, flirting with men. Chatting with a friend with endless champagnes by the pool, etc. Entertainment, various shows. That sort of thing from what I gather.
It's not my jam, but she always has a great time, folk like different things at that's perfectly ok.
I mean, I really hate HATE beach holidays, sea, sand and sun, that sort of thing. Or AI. It bores me to tears and makes me grumpy and restless. But I don't struggle at all to understand why other people like them.
To be honest, what I do struggle to understand is camping. I mean, objectively I can see the reasons for it, but it's so so far from my idea of holiday, I'd honestly rather go on cruise, or the crappiest -10 star hostel somewhere in Benidorm, or scrub public toilets for a few days than camp somewhere in a tent/caravan. But oh well. Different strokes and all that.