Formal and informal words

[skymoon]

Hi,

I have identified both formal and informal words in the paragraph below, am I right?

Formal: elegantly;
Informal: end the day, one-of-a-kind, must do;

"After a long day enjoying all that Three Castle Kingdom has to offer, a retreat to the elegantly Roman-themed Hotel and Spa is the perfect way to end the day. Whether guests are staying for a night or a week, they will never run out of things to do at this first class hotel resort. Set against the backdrop of a Roman palace and featuring amenities such as a five-star restaurant, specialty shopping, themed dining, hiking trails and a world-class spa and fitness centre, this one-of-a-kind resort is a ‘must do’ for anyone visiting Three Castle Kingdom."


And beside formal and informal, which words or phrase have first stimuated your eyes? and why? (Because, as an Ad statement of this passage, I don't see any special features that can draw audience's attention)

skymoon

[Anglika]

You have a go at identifying them and we can then advise you.