Female Solo Travelling during the Holidays

I’m a Canadian female who wants to travel during Christmas break since I get time off work. I’m looking at Colombia, Peru or Costa Rica. I’ve never really solo travelled before and everyone keeps recommending that I sign up for tours instead of going in without a plan. I wanted to hear peoples thoughts on this and maybe which location I should pick?

I was thinking since Costa Rica is smaller it should be easier to do in a short amount of time or maybe Machu Picchu in Peru? I don’t know whether to sign up for a tour as they’re all either expensive or don’t include a lot of actives? But then I’m worried about hotels/getting around if I don’t do a tour?

Female Solo Travelling during the Holidays