Where should Sabrina go on Summer Vacation?

The three specific worlds you mentioned are all great places for our simmies to vacation in and I came close to selecting Sulani. I decided to vote for my current favorite world, Tartosa. I'll admit I've done a lot of work on my version and I have more planned, so it's not like the original and there is plenty for my sims to do apart from weddings.

i never seem to find a reason to go to sulani despite owning island living since it came out so any excuse to go lay on the beach and get burnt is ok with me (also i turned one of the beaches into a nudist beach and on the rare occasion i do go to sulani i always forget about it until i arrive and i always get confused on why everyone is walking around in the nude)

My two favorites are Sulani and the Selvadorado.

I like the kick back feel of Sulani. I have a fisherman that loves to go fish there, especially in his boat. Some just like to go to relax, collect shells, beach comb, or get a Suntan. Others like to go to have fun swimming, scuba diving, or jet skiing. I also have a night club there for nighttime fun. Some like to do part time jobs for people when they get there. I think this should be where she goes to kickback and enjoy her summer.

Silvadorado is good for those that like to explore the Jungle and like archeology. I have wanted something like jungle adventure since the Sims 2 came out, so jungle adventure is my favorite game pack. I just wish I could have sims live there. I love that they added more harvestables with jungle adventure and Island living.

I like MT Komorebi. There is so much to do there what with the mountain excursion, skiing, snowboarding etc. She won't be short of fun activities. :)