I would prefer not to travel in group-tours but it would depend on what kind of tour actually. For example a one-day boat trip around the island where they stop a few times to swim or anything else well I do really enjoy those! Have done it a couple of times and I made some new friends I hung out with the rest of the holiday! =) With museums...that's a no for me, not a big fan of them so during a tour it would take way too long for me and when something doesn't really interest me I have very less patience haha.
Other than that, I rather travel with people I know like my friends or family because completely alone is something I don't see myself doing. I am very attached to my friends and family so I would bring at least someone with me to make memories with! ^.^
PS: Add "Otherwise" to the poll?