What do I do with a classics gap year?

So I have myself in a bit of a pickle;

I have applied to uni for Ancient History and received all 5 of my offers, however, back when I first started VI form, I was adamant that I wanted to study Classics, but this faded as school went on - so I feel like I have rushed into this decision to study Ancient History rather than Classics. I changed my Manchester course to Classics no problem, and the uni itself is nice but I wasn't too fussed by it at the open day. You see, as much as these two courses are similar, the universities I applied to were for their Ancient History course, not their Classics course, and I can't ask the three of the unis I have applied to to change my course to Classics, as they have Latin/Greek as a prerequisite. I am thinking of a gap year so I can fully decide what to do then reapply. I'm projected AAAA, but definitely think I could achieve at least A*A*AA; so I would consider applying for Oxford, KCL, Bristol, Manchester and Liverpool; the only thing being, what would I do with my gap year? it would have to be academic and relevant to my chosen degree, I just need ideas of what I could actually do with this.

Many thanks

Josef