I found this list a long time ago and always liked it.

Make a photo scrapbook
Watch the clouds
Make lemonade from scratch
Spend the whole day in a hammock
Plant an herb garden
Press flowers
Wear only white for a week
Read romantic Russian novels
Skinny dip in the moonlight
Play all of your old records
Spend a silent day
Fast on fruit juices and water
Write a letter and many postcards
Read poetry
Polish the silver
Visit the library
Wander in the museum
Do crossword puzzles
Go clamming
Go Antiquing
Ride horseback around a lake, ocean or mountain top
Make a kite...fly a kite
Go to a country fair
Fill the house with flowers
Make ice cream
Sleep outdoors
Put flowers on a floppy hat
Walk barefoot
Pick the morning glories
Toast marshmallows on the beach
Ride a roller coaster
Have lunch in your bathing suit
Ride in a convertible
Watch shooting stars
Listen to classical music
Hum
Play Cribbage
Smell fresh mint
Meander among wildflowers
Give someone a rub with coconut oil
Snooze in the sun
Run through sprinklers