We literally just got back from Jasper/Banff/Lake Louise last night. We did not do the ABD, but I modeled our trip after a mix of ABD, Tauck, and other group trips that are out there. The three "big" activities that are close to Jasper are the Glacier Icewalk/Glacier Skywalk and the Maligne Lake Cruise. Both of these are operated by Pursuit Banff Jasper Collection (they are the only tour providers that run these activities). We did both and I HIGHLY recommend them. The Glacier Icewalk is amazing (you could skip the Skywalk, but we enjoyed it), and Maligne Lake is stunning. We did the premium cruise, with an extended stop on Spirit Island, and I think that's worth it. Before the Maligne Lake Cruise we also did a hike of Maligne Canyon on our own - it does not require a guide, assuming you have a car. The other big attraction in town is the Jasper SkyTram. You can easily walk up and do this on your own (or pre-book a ticket, if it's busy).
The other natural sites/attractions in the area that you can easily see/do on your own are Athabasca Falls, Sunwapta Falls, Peyto Lake, and the Valley of the Five Lakes hike. None of these activities require a guide. You could also drive over to Yoho National Park and visit Takakkawa Falls. We wanted to do this, but the road was not open (it should be open later this week).
The other thing we did in the area (although, we met our guide at Lake Louise) was a Via Ferrata at Mt. Shelfox/Abraham Lake (which is about as close to Jasper as it is to Lake Louise). This is quite an adventurous activity that involves rock/mountain climbing, but if y'all are up for that, I cannot recommend Rockies Ice Specialists (
https://rockies-ice.com/) enough. My son and I had a guided climb with one of their guides, and it was amazing. You do have to be very brave/adventurous to complete this challenge, though.
If you have any specific questions or want more specific details, feel free to PM me. I also chronicled our entire trip on Instagram and will give you my username so you can check everything out for yourself.
Just to clarify - we had our own car. I'm not aware of any tour companies that will drive you around, mainly because the distances are kind of far and the hikes are sort of meant to be done on your own. I did see a bunch of tour buses for a company called Discover Banff Tours and Brewster Sightseeing. They might provide transport to/from specific activities/attractions.
Also, Jasper is a bit of a drive from Lake Louise. We actually spent three nights/two and a half days there. The attractions in/around Jasper are pretty spread out - we did the SkyTram the first afternoon (after driving up from Calgary), did the Glacier, waterfalls, and Valley of the Five Lakes hike the next day (and that pretty much took all day), and the Maligne Canyon Hike and Maligne Lake cruise the day after that (and those two activities pretty much took all day, too). Maligne Lake is the farthest north, and a bit to the east. The SkyTram is in the center of Jasper. The Glacier and the waterfalls and hike are south of Jasper along the Icefields Parkway.
Since the ABD technically ends in Banff, I would look into renting your own car there, driving up to Jasper and back (maybe even consider spending the night up there), and then see if ABD will still cover your transfer from Banff back to Calgary (only because renting a car in Banff and returning it to Calgary is going to be expensive). Alternatively, you can pay for your own transfer from Banff back to Calgary - there are plenty of companies that do that.
