What changes should be made to island living to make it better

The addition of a large cave lot that is accessible through the cave entrance. Fully fleshed out and playable conservationist and lifeguard careers. More lore/background surrounding mermaids, more interactions for them. Overhaul of the Island Elementals with a few rituals you can perform with them. Like a fertility ritual (to increase the chance of twins or triplets), immortality ritual (live forever on the islands), a fortune ritual (better luck in social interactions and life events) or even a malicious natural disaster ritual (to evoke earthquakes and storms).

I personally think that they should save Hotels for another pack. With Island Living, the team clearly went with more of a cultural and environmentally conscious approach of the island theme. I've always interpreted Isla Paradiso in the Sims 3 as more of a commercial destination Island, and Sulani as an undiscovered Polynesian hideaway. But that's just personal, I guess - I'd rather see them expand on the features that are already there.

Underwater gameplay and expansion of the mermaids! There just isn’t enough for these guys and it makes me so sad ?

If they're ever going to update a pack,i hope it'll be Island Living. I love this pack so much,but they didn't fulfill its potential at all. As others have mentioned,houseboats and underwater gameplay should be there.Surfing would've been cool too.Mermaids and elementals are bland,would love improvement on those,especially mermaids. Hammocks would be a nice touch as well.

I wish two sims or more could ride the canoe.