How To "Hide/Mask" Your H2 Titles in Wordpress

Howdy Warriors!

I'm very new to html but I was wondering if any of you could help me with my problem.

I want to have an h2 tag on my website with my keyword in it, but only for the SEO purposes (I don't want the actual users to pay attention to it).

First, I had 2 options in mind:

-Option one:

Change the font size of h2 tags to the text font size and insert the keyword in h2 tags inbetween ordinary text. This did not work however, because Wordpress kept pushing the h2 tag into separate line and wouldn't integrate it with the text.

- Option two:

Change the font size of h2 tags to really small, select white color and put it somewhere on the page, so the users won't be able to see it, but the spiders will. This is a "BlueFart" technique however, and I don't know if search engines will punish me for doing this...

Anyway - is there any convinient way I can achieve this without the users actually seeing the h2 tag stick out on my page?

I'm asking this because I have a web-page which really needs no text, so I'm trying to keep it to minimum, yet still optimizing the on-page factors.

Thank you!

EDIT: Is it possible to put an image as your h2 title? And set the image alt text as the h2 title? Does this cary the same weight as ordinary text in h2 tags?

Like this:

<h2>
<a href="http://WEBSITE.com">
<img src="logo.png" alt="h2 alt text" />
</a>
</h2>