Ideas

So my crush invited me to the local swimming pool and told me to invite some of my Friends and I really want to go but I hate wearing my costume da bagno in front of anyone, like seriously the only people who have seen me in my swimmers are my really close friends. I was thinking we could all go to the shopping mall o somewhere else but how do I suggest that instead of the swimming pool? What should my excuse be for not being able to go to the pool?

Any ideas are appreciated :)

Thanks.