This is me tossing out some fun birthday activities:
1. Have the party anyway with your one friend who lives close by. Dress up, decorate the house, dance to loud music, drink champagne (or beverageof your choice). Make your Pinterest dreams come true. Don't fret about if everyone is having a good time because it's just the two of you. Go to bed whenever you feel like it instead of having to hint to people that it's time to leave.
2. Go out with your friend who lives close by. Go to a slightly more upscale bar/club than you're used go. Hire a private booth or a table and tell the staff you're celebrating a birthday and see if they toss a free drink in there anywhere π. Turn it into a bar hopping session if you have a few places you want to go and see how many free drinks you can get.
3. If your budget allows - get the fanciest room you can in the fanciest local hotel. Go alone or bring a friend. Take a long bubble bath with a glass of champagne (or drink of your choice) , wear a new set of fancy pyjamas, order a takeaway or room service. Dance to loud music if the mood takes you or just keep it low key and watch a film. If the hotel has a spa, go to the spa.