pickins are slim. I think the downtown Grand still has one. the Fremont, Cal, and MSS have a section with $5 machines. do post pics if you hit anything.
GN, GG, D and DG (although I haven't checked in a while). Don't know about the rest. GN is somewhat secluded. GG and D are less secluded, and will not be any quieter than the casino floor. DG is quiet in any event. Games are more limited at GG and DG. GN is going to start at $100, but in practice, $50. There is some question about baccarat at the D, some good rules (4%), but whether its midi or mini until you get to $100. Better ask first. Table game tracking? Better ask each place when you're done playing.
Speaking specifically of tables, going from west to east... Plaza: None Main Street Station: None California: None Golden Gate: Small, raised area just off the main casino floor. Just three tables. Doesn't really feel like a different room. Golden Nugget: Probably the most notable downtown. About six tables, if I remember correctly. Baccarat and BJ, about $50 minimum most of the time. Not too far away is also a pretty sizeable selection of HL slot machines. Binion's: None Fremont: None Four Queens: None The D: Like Golden Gate, there's a small raised area just off the main casino floor. A bit more secluded than GG. Three tables (or four, I don't remember). Downtown Grand: None. Though I do recall there being a room of about 150 square feet that has high limit slots. El Cortez: None