Should I still go with them on vacation?

Every year at at the beginning of summer my cousins take me to the Colorado river with them for a few days and it is a lot of fun. Today I learned my cousin has mono and I don't know if i should go anymore. I recently met this girl and we already agreed we are going to have the an amazing summer together but if I end up getting mono I wouldn't be able to kiss her at all and we are both leaving for college at the end of summer so won't see her for a while!. And the river trip is what I look forward to every year it is my favorite place on earth.

Should I still go and risk getting mono and not being able to have an amazing summer with this girl I really like?

I'm 17 male just graduated and yes my cousin with mono is definitely going