with Lisa take the lounger next to her till she gets bored and leaves, then follow her to the changeing rooms.Bro, I managed to go on Friday with Brenda and that mission is accomplished, no new missions appeared.
When I go on the weekend to talk to Lisa on the beach she is always with a book and nothing else happens. I went to see her during the week at school but there is nothing to do.
Likewise with Michelle, I must have one more step left to follow.
Pretty much everything in this game has a prompt, what does your hints say you should do