If you link your reservations, like everyone else has said, they'll seat you together.
For the rest, I would let everyone know that they can plan their own excursions and activities. Then, you can let them know what you've planned for your family, if you're so inclined, so if they want to book as well they can, but I wouldn't take on the responsibility of booking for them, that's just asking for a whole lot of coordination work!
You can always talk about the next day's activities at dinner each night, determine if you're going to hook up for an event, or a meal, etc., I just wouldn't plan them ahead of time.
Completely agree! We are planning a spring break cruise, and I laid out the ground rules in my invitation. I think number 7 is the most important.
Greetings! A few of us have decided on a senior spring break trip for next year. We want to invite you (and others) to join us, even if you don't have a senior. Details below, but first, the ground rules:
1. The list of invitees is neither complete, fixed, nor accurate. I refuse to accept any guilt, shame, nor evil eye for having left someone off the list. This is the freakin' planning stages. So if you aren't on this list, get on the list. Maybe I goofed, maybe I had the wrong email; doesn't matter. By the way, someone forward this to the Rollers, because I don't have their email. To be clear, I have friends I like better than any of you, and I did not put them on the list because I happen to know they are deathly afraid of cruising. So if you aren't on the list, it is because I care about you so much.
2. Feel free to invite others. Got a friend in Dubuque? Invite them to join us!
3. If you know you don't want to go, let me know so that I can remove you from the list, so you don't get spammed.
4. My email address book is a mess. Let me know specifically and clearly which email to use for you, and I shall.
5. In general, let's try not to spam people by replying to all. Feel free to reply to all whenever you think it is appropriate.
6. Don't reply to all five times today as a joke about rule 5. Already figured that one out, so it isn't funny now. Sorry.
7. I am not signing you up for anything. Not the cruise, not the excursions, nothing. If you want to go on the trip, if you want to swim in caves in Cozumel, if you want to meet your friend at the pool, do it. I will gladly offer advice, join you, might ask you to join us, but don't think I am putting in your name and have stuff taken care of: I don't.