Honeymoon Booked

So happy to say that our Honeymoon is now booked. The Honeymoon has been the most stressful for me. I’ve not planned a trip like this before and I’m not one who deals with uncertainty well so it had me freaked out. However, now we have our flights/train and hotels booked for London and Paris. We just need to book any tours/passes to sights that we want.
Recommendations are welcome. Certainly want to do the London eye, London Tower and see the sights like Big Ben etc. Paris, again the main tourist things like the Eiffel Tower etc but some specific things in Paris for me is the Catacombs and the Moulin Rouge.
Many vegetarians/vegans out there, I’d love some food recommendations.