Meals at Universal - how to pay

[WDWAtLast]

headed out tomorrow and I am wondering should I be bringing more cash than I had planned? (Don't like to travel with large amounts) Staying at HRH but no dining plan. Can I charge most meals/snacks to my room or I do need my CC with me? Are many snacks cash only? What about Citywalk restaurants? Do most take CC's? Thanks - as usual I am running around trying to finalize and pack thd day before our trip!