Hey no problem Tan. Last year I went to Celebration III and it was awesome. I took my 15 year old cousin so basically anything I wanted to do, he was on board. This year I am taking my spouse and, well, I can't do anything I want to do. LA has all sorts of stuff to do. Take your sister to see some of the sites. Make her come to the con with you during the day and then show her Hollywood at night. If you get a nicer hotel,(hopefully through the block of rooms LFL and Gen Con will have set aside) it will have a pool. Maybe if your sister doesn't want to go to the con one day, she can hang out by the pool.