10. Farmers' market shopping trip
Take your honey to the Memphis Farmers Market one Saturday morning. It's totally free to enjoy the live music, cooking, and exercise demos, and peruse the produce, local meat, and other goods. Then use your $20 to buy coffee and brunch from one of several food trucks, or pick up some fresh veggies and protein to take home and cook dinner together.
11. A night at the theatre
Playhouse on the Square is a professional resident theatre company showing a solid rotation of musicals, comedies, and dramas. For each show, they offer one pay-what-you-can night on a Thursday (just be sure to get your tickets as soon as possible -- they tend to sell out). You and your cultured companion can enjoy a drama, comedy, or musical with a $10 donation each.