In general
NON-RESORT Marriotts, JW Marriotts, and Renaissance properties have lounges. Most lounges in the North America properties are close on weekends but a very few make exceptions to those rules. Most lounges outside of North America are open 7 days a week and Asian properties have some of the best lounges IMO.
With rare exceptions there will not be a lounge nor will you get breakfast as an elite benefit at
RESORT properties. There are a few exceptions, all of which seem to be in Thailand TTBOMK.
Check the sticky at the link provided by RogerD408 in the post above for info about specific properties.
Marriott Rewards T&C outline the above paraphrased rules in detail. I would suggest if you are new to Marriott to check them out as your life will be much less frustrating from the unknown down the road.