I just thought I'd (do something)

Use this phrase to explain what you're doing, and make it sound like you just suddenly decided to do it.

You could also say it this way:

I wanted to come out and get some fresh air and sunshine.

But "I wanted to ___" doesn't tell how long you wanted to do something. It could mean any of these:

• You've wanted to do it for a long time.
• You just decided that you want to do it.
• You wanted to do it in the past, but now you don't.

"I just thought I'd ___" expresses the idea of deciding quickly and without thinking too carefully about something. Here are some other examples:

I just thought I'd stop by and see how you're doing.

No, there's no special occasion; I just thought I'd clean up a little bit.

Hey. Are you OK? I just thought I'd see if you needed any help.

get some fresh air

To "get some fresh air" means to open a window or go outside, so that you can breathe air that comes from outdoors.

Turn off the computer, go outside, get some fresh air, and relax.

fresh air and sunshine

"Fresh air" and "sunshine" are two things that people often talk about together. "Fresh air" usually comes first:

What she needed was fresh air and sunshine, and good, solid food.