Write a journal entry as if it has already all happened. Things that are possible (not "Today I flew to Tahiti... wow, is it gorgeous here!") Include things you would like to be able to write about tonight or tomorrow night. Maybe you'd like to have a conversation with a friend or family member, maybe you'd like to finish planting a section of your garden, maybe you'd like to go shopping and have lunch with a girlfriend you haven't seen in a while, maybe you'd like to clean out your girls' playroom (oh, um, oops that's mine....)
Fun or not, if you'd like to include it as a reality in your next journal entry, write it down.
Now use that as inspiration and focus to live the day you imagined.
If you try this, I'd love to hear about it!