Is Contiki right for me?

Hello there!

I was wonderinf if anyone can help me out! I am a 25 yr old female, travelling solo, who does not drink. I am really into sightseeing and normally on my vacations, I sightsee all day long and then head to bed at like 10pm for an early morning of sightseeing again.

I was wondering if Contiki tours are not really a good option for me? I have heard mixed reviews re: these tours. Some people say that everyone drinks and parties every night and do not even sightsee because they are hung over and sleep during the day...is this true?

Also, has anyone ever been on a GAP or Intrepid tour?

Thanks!