FREE SOUNDS: Stop by the Inner Harbor's Amphitheater between Harborplace's pavilions at 5 o'clock this evening and hear some live music -- free. The group is called Cry Monday, and specializes in old and new favorites. The concert will end at 7 p.m. It's part of the Beefeater Cool Summer Sounds concert series on Saturday evenings in June.
* On Thursday, forget those Cosby reruns and get to Hopkins Plaza for another free concert. Upbeat jazz played by Global Function is the attraction of tonight's 7 o'clock gig -- part of the La Provence Thursday Night Concert Series.
DAY-TRIPPER: Spend an entire day relaxing on a miniature cruise for under $20. Harbor Cruises began its daylong cruises from the Inner Harbor to Annapolis this week. The next run on the Lady Baltimore is Wednesday, June 24. Launch time each Wednesday is 8:30 a.m., returning to Baltimore at 5:30 p.m. Information: 727-3113.