How do I respond to this?

ok, here is my story- I was catching up with someone that i was speaking to online and we were filling eachother in on what we have been up to recently. So i told her that i have just came back from vacation, and in her next email she wrote '' i would enjoy a vacation with you.''
I didnt know how to respond to that- it was a nice gesture and inside i was thinking ''wow, really? hmmm'' but i have not sent her a message back yet. How should i respond?

We are going to need a lot more background to give you an answer...

do you like her?
are you dating her?

I met her on MySpace. I like this girl though, but i dont want her to think that i am not interested in her because i am- i think about her often and at random times and my ''friendship'' with her feels important to me and im hopeful about it. Realistically though it still feels like we are in the initial stages of getting to know eachother. I have not asked her where she wants this to go between us? I would like to at least speak to her on the phone as well, and hopefully meet her in person, but she may not want the same things and may just want to stay just online friends. Im not sure, because sometimes it feels like i make more of an effort to keep in contact than she does. She would send me a message and i will get back to her the same day. Sometimes i send her a message and i dont hear from her in like three/four days- sometimes a week.

why don't you ask to speak to her then?

i will. but at the moment we are just getting back in contact.

you should tell her you should get together first, to make sure you don't want to kill each other. Be light and playful about it.