Day Trip to Toledo

The churches and synagogues close between 18:30 and 19:00, so you'd probably only see one of those. Wandering the narrow streets is half the fun, and it's the type of place where you can get lost in them. Bring a flashlight if you'll be walking after dark. Be sure that you have your tickets booked for the last return train, since it can sell out.

I'd say it would be worth it if you'll have a few hours there. It's a fun city to walk around in. Make sure you don't get too lost, though, since you don't want to miss your bus! (I recommend "digital breadcrumbs".)

I think any just about any opportunity to visit Toledo should be seized, but do travel with info on return schedules for both buses and trains, being careful about day of the week. Rick warns that the final bus of the day can sell out; I'm not sure about trains since I took the (cheaper) bus.

Toledo's historic area is quite large and fairly hilly, so do some research ahead of time to figure out where you want to wander, and give serious consideration to starting at the place farthest from the train/bus stations and working your way back. The stations are down below historic Toledo; access is from an area near Zocodover Square. Because of the limited time you have available, you'll almost certainly want to take a taxi up to (or at least near) the first area you want to see. The walk, though augmented with escalators, takes quite a bit of time that you do not have.

Don't worry about walking in the dark. The last train back is at 21.30. Sunset in Madrid on May 1 is at 21.18.