Sling Thing Front

I'm supposed to go to Hershey Park with my boyfriend & his family this saturday.. only problem is, i fell down the stairs a week ago, bruising my radius bone severely & i also sprained my shoulder. I want to know if i should go and not get on any rough ride, because i know most rollercoasters you wrap your arms around and hold on in front of you, but i am unable to do so. bruise is right there under my elbow. another issues i'm having is, i am sorta in pain all day long, i can't lean my arm on anything, or else it hurts so bad it brings me to tears, & i need to wear a sling. .. r should i just say i can't go... the thing is i'd feel terrible saying i can't go i don't like to say no, unless i absolutely have to, in this case i don't know if i HAVE to or not.. any advice?

thanks in advance!