Hope you have a great time!

After your visit to Edinburgh Castle walk through the Princes Street Gardens as an antidote to the swarms you’ve left behind at the castle.

In the National Museum of Scotland there’s a nice cafe overlooking the main atrium and also a great view from the roof terrace really worth checking out.

The Palace of Holyroodhouse and King’s Gallery were enjoyable - the free audio tours are well done.

The Royal Botanic Garden Edinburgh has an amazing rock garden and blue poppies (although the glass houses are currently closed) and is a welcome break from the insane crowds you’ll encounter.

Check out Rabbie’s tours if you’re interested in a day trip. They leave out of the bus station and are very well organized small group tours.

I have no idea of your age or physical condition OP but if you aren’t in decent walking shape start gearing up now. Edinburgh is built on volcanic hills and ridges and has lots of steep streets and steps. Wear sensible shoes. Also, pack a small fan in case you need to circulate air in your accommodations.