I have never been on a bus tour & am uncertain as to how to pack. Will I need snacks, a blanket, a travel pillow? How about the laptop, ipods, etc? I don't want to leave a lot of electronics on the bus, but I don't want to be bored during any of the longer stretches of drive time either. Thanks!
(Spirit of America trip)
ABD's are not bus tours! The bus (motorcoach!

) is only used to get you from Point A to Point B. Once you get to your destination, there are activities, hikes, walking tours, etc. The bus is just transportation; you don't sit on the motorcoach and have sights pointed out to you (unless you happen to pass them on your way from Point A to Point B.) Many times you won't see the motorcoach again until it's time to return to your hotel. And if the hotel is in walking distance, not even then!
To answer your questions:
You will not need snacks unless there is something very specific you need or want. Snacks are readily available from the ABD Guides.
A blanket would be up to you. The motorcoaches I've been on have been extremely comfortable and climate-controlled, but that *may* vary by locale. If you chill easily, you might want to bring one; those are not provided. You won't be on the bus overnight or anything of that nature, you will travel during normal daytime hours. If you like a nap, you might want a blanket/pillow, but it's really not necessary (I've never seen anyone bring one, but I've only been on Adults Only trips; some may bring them for their kids).
Again, travel pillow is up to you. Most of the trips you aren't on the motorcoach for extremely long times (there are some exceptions) but if you want one, bring it. I found the seats so comfy I never used mine, and I have a really bad back.
Generally, any long stretches on the bus are between hotels. So you could bring the electronics with you, and then take them off & put them in your hotel. I know on the 2 trips I've been on, we had the same motorcoach & driver for the entire trip, and could leave anything we wanted to on the bus, which was always either locked or attended by the bus driver or both. It always felt safe to do this.
Maybe someone who has taken this specific trip can help you more. But I can try to answer any other questions you might have.
Sayhello