Not going there is my biggest regret
I flew around it in a helicoptor. Checked into it and the resort pricing was reasonable. It is on our trip list for 2023, but we'll see. Our trips have been shuffled due to Covid.
Honestly, you can't go wrong with any Hawaiian island, but Honolulu is my least favorite. I've been to Hawaii 13 times, including Honolulu, Maui, Kauai and the Big Island, and I personally prefer Maui, as I find the perfect mix of size, things to do, restaurants, etc. It is also the "condo" island, so you can easily find a nice place to stay, and with family a condo can be a lot more fun and less expensive than multiple hotel rooms. Car rentals are more expensive on Maui, at least in my experience.
I wouldn't to Kauai with someone with mobility issues. It is quiet, everything closes early, not as many food choices, etc. Not a lot of entertainment for someone not super mobile compared to the other islands. I love it for the nature and hiking, but wouldn't take my parents there (or very small kids). I did take my older parents, and my dad struggles to get around, to Honolulu and Maui, and they loved the Maui trip much, much more.
Honolulu is nice, but too many people. I used to love going to Lanikai beach, kayak to the small bird sanctuary island (a tiger shark bumped our little boat, I about crapped myself) and Wailua and just hang out there, but now (last 5 years) it has gotten overcrowded. I used to love taking friends there because it was so quiet. Now it's a damn zoo (at least pre-Covid). The Big Island is #2 on my list, but if I told my parents, their only choice would be Maui.