In my opinion, I prefer cruising first but for sake of vanity! Before the trip I get my nails done, possibly a spray tan, hair removal, have been working out and watching what I eat, etc. Normally I don't spend much time on my appearance.....really! But when I hit the parks first, my tan fades, my polish chips, I indulge in park treats and so on. Essentially, my carriage turns into a pumpkin and My dress turns into rags!
I've also found that after a cruise I'm so sad to leave that I am thrilled to enjoy some more magic before heading home. It's so sad to get off the ship and go straight to the airport.
Have a great time!