Thanks - what I mean by sessions is excursion time from the cruise ship (the ship I was on last year had AM and PM departure times). In this case, I am on Celebrity and the excursion leaves at 10:30 am. By the time the bus arrives at 11:30 all the chairs and umbrellas will be long gone. I can't chance not having shade with my fair skin, so unless there is a way to definitely reserve an umbrella (don't care so much about a chair) I guess I skip Horseshoe this trip.