Amtrak Vacations will sell you a ticket, as well as handle the hotel reservation, without any sort of package.
This particular topic has been discussed around these parts before, but I'd be wary of booking through Amtrak Vacations. The third party service which handles the bookings are not, despite their operational name, train travel professionals.
A year or two ago I encountered a couple on the
California Zephyr who got on when I did at Sacramento or shortly thereafter and they related their horror story about their Amtrak Vacations experience where, by the time I met them, they were on the last leg of. The details are a bit fuzzy now but it basically had to do with booking rail travel and hotel accommodations on a tight schedule that didn't take into account real-world experience traveling with Amtrak.
IIRC, they booked the California National Park tour (like Yosemite and perhaps another park) and while that part of the trip went okay, the connections to/from the tour went awry. Due to track construction and weather-related delays, they missed their booked hotel on one part of the trip and were put up in a fleabag motel and then endured a bustitution during a later part of the trip which could have been avoided if the person booking the rail portion was savvy enough to be aware of potential issues and do a rerouting. They eventually figured this out on their own and when they called to complain, the person answering the phone was clueless as to how anything was wrong and basically said "oh well"---even after they pointed out that their trip wasn't as promised, or booked (in the case of the hotel downgrade).
I felt sorry for them as it was their first Amtrak trip and unlike the glamourous routing promised in the catalog, it was like the rail version of being booked on a cruise and finding you are traveling by yacht instead of oceanliner. I tried to explain why they should have had a better experience, but I was embarrassed for Amtrak Vacations and the seemingly oblivious way in which the booking was handled.
A far better option would be to use the aforementioned Train Travel Consulting, which appears to literally be a mom-and-pop operation with years of actual experience booking and traveling on Amtrak (and VIA Rail).
But I will agree with
dogbert617, the AV catalogs sure are fun to look through.