What time do activities start on the Navigator on embarkation day? By activities I mean the waterslides, flow rider, rock climbing? I was able to get a 10:30 check-in time so hopping that the activities will start up soon after embarkation to make the most of a 4 day cruise. Are there usually long lines for these activities during the cruise I'm sure the flow rider will have long lines as the line moves so slowly, how about the slides?