6 month old Christmas Activities?

Hi ladies!!! I'm hoping for some advice. My family will be visiting for Christmas and at that time my LO will be 6 months. They are wanting to do outings or 2-3 hour Christmas cruise things. My question is, at 6 months, what are good baby-friendly outings? I imagine he may be sitting up by then (he already almost is now). But I don't know what he will be aware of or enjoy.

Any ideas???