Christmas 2018 we looked around Poly, AKL, VGF, BLT, SSR, CC, BW and BC. We got the bus from a park or DS and walked into each of them.
There is a showroom for BW just off the boardwalk if you would like to see a BWV room. We did the tour at SSR and saw CC, Poly and Aulani rooms. I assume it’s RR, CC and Aulani now.
We went into the corridors and had a look in CC as we were seriously considering buying there. We also did the same at BLT. The only places we couldn’t get into were some pool areas as you needed a magic band. You can walk into the lobby at BLT but we were also able to access the bridge from contemporary. No one asked us what we were doing at any point or turned us away. Disney encourages visitors to look around the resorts and we did ask if we could look at the corridors and every cast member we spoke to was really helpful. We just couldn’t look in the rooms.
We ended up buying RR before it was open but are staying at BC, AKL, VGF in a few months as we intend to add on a resale contract. If you have time I would recommend a tour.