waterpark or lake while pregnant?

i’ve read on here quite a bit about not going to the water park while you’re pregnant. i’m 6 weeks. i was wondering why you can’t go to the waterparks? and can i go to the lake still? and if not, why?

also i had someone at work inform me i was not supposed to be drinking my white chocolate frapp in a bottle from starbucks, other than maybe it having more than 200g of caffeine i can’t think of why i can’t drink it? is there anything i can eat or do?😂😂😂