I'm going to be cruising on Arcadia soon, and have never sailed with P&O at all before, though have done a number of other cruise lines. I've had trouble navigating the P&O website, so thought I'd come here and ask - what are all the best bits of Arcadia? Would love to know what to look out for in a positive way, any tips and tricks to get the best from my cruise. For example - sounds like there's some free spa access, but some paid for - is the paid for good or will I be happy with the free part? How are the bars?