Apple Watch Series 3 Functionality Without iPhone

I just got an Apple Watch Series 3 (no cellular) for Christmas. I use it to track my exercise, calories, stand, heart rate, etc. I particularly enjoy the added motivation that comes from earning badges and closing my rings each day and I currently have a nice streak going for me. I will be vacationing (hopefully) in the spring on a cruise ship and will not have wifi or cellular service. However, I still plan to workout on vacation and am wondering if my watch will continue to track my activity? And if so, will it automatically sync with my iPhone fitness app once I am back in port and wifi and cell service are restored?