In Grand Rapids, the 29th Street Antiques Mall is a fun place to spend an afternoon poking around the 100+ booths inside a huge building. The vendors have an excellent variety of vintage and retro stuff from dishes & toys & jewelry & furniture & books & clothing to vintage Christmas decorations--lots of fun to look through.It's all air-conditioned,  and a bit like a treasure hunt with many different areas to discover!.  It's very handy to restaurants and hotels along 28th street-- just taken Breton Road south and then turn east on 29th street and go a block or two.