You can sign up for free wifi anytime the first day on your phone- it's easy
Download the
DCL app before you board so that you aren't using slow/expensive wifi, it will start working once you board, you can do this at your convenience, no rush
You can schedule character meets and breakfast online now so you don't have to go to guest services
If you get the dining time and ressies you want you're all set.
The only things you cant do online are mixology/tasting classes and certain spa things like the rainforest lengt of cruise package (I've heard these are limited too so you might want to do this early if you want it)
You can register your kids for the kids club online, then whenever you take them for the first time they can get their arm bands- no reason to stand in line as soon as you board unless they want to go to open house right away, then it might be worth it while you're there
Basically, Im trying to point out that you might not HAVE to do anything when you board but start having fun- no lines etc
Things that Im glad I did:
If you have kids, try to leave muster drill immediately to get a good spot at sail away. Otherwise I'd grab a drink in the adult only area.
I made sure I met our stateroom host so that I could explain our napping/sleeping situation so that he could leave down certain beds and do turn down early for us.
Put out formal night clothes + anything that needs ironing for laundry services