S.Y.
Wow, I've vacationed with a baby and sailed with a toddler but never sailed with a baby... I wouldnt' take bumbo for hte same reason the other poster mentioned. When I traveled with my 8 month old, I took foam mats so the baby could crawl around and get his exercise that way. Given that will be hard to do because you're flying, I would buy a thick beach blanket that you could lay out so the baby would crawl around there. At 8 months, he should be able to sit on his own, with some back up from you, so I would just have him next to you, wherever you are. Will you also bring a floatie thingie that you can sit him into (like a tube) when you are in the pool or sea, with a canopy? That was a lifesaver for us when we went to the Caribbean and my son adored it! Have a GREAT time!