Wear clothes from a bygone era: Take a step back in time and get into a period costume of your choice.
Fix a date with a childhood crush: Feel bad that you never asked your crush out? Then call them and meet up.
Have that family reunion: Go heavy on family sentiment and have them around you so that all of you can enjoy your birthday.
Feed the ducks in the park: Take some bread and feed the birds out in the pond and have that peaceful feeling wash over you.
Wear a tiara: Feel like a prince/ princess and wear that tiara the whole day.