I would suggest to look around the area that you live in (in a radius about, oh, y'know.. as close to as far as you want to drive.. hehe). There's bound to be somewhere fun/romantic/what have you in the area that you've never been to but have always wanted to try out. :)
California's a fun option... I moved here 2 years ago, so pretty much everywhere in CA is new to me, and my husband and I ended up going to Monterey Bay for our honeymoon. We found a cool motel/hotel/inn where our room was set up like a little mini cottage, complete with comfy couch, tv, mini kitchen, nice bathroom and a king size bed. Because it was during the peak season, it was about $165 a nite, but still, that isn't bad @ all... We were able to visit Cannery Row and the Fisherman's Wharf (and hit the awesome antique mall...I'm an antique nerd) and go to the Monterey Bay Aquarium. It was a very relaxing honeymoon and the whole thing, including gas and meals and souvenirs, was around $1000.
The northern coast of CA has tons of cool places, too, including the redwoods (which is where I'd love to go for our anniversary this summer:)).
Usually, the longer you book, the less expensive it is per nite, so if you're able to stay for a week or so, then chances are you'll get a better discount.
One last thing, wherever you go, including @ restaurants and shops, be sure to tell them that it's your honeymoon!!! lol.
Sometimes they give you discounts or other freebies because you're newlyweds, and they always are super friendly and tell you congratulations. :)
Good luck on finding the perfect spot for you two and congratulations on your marriage:)