I like giving and getting gifts, and DH is meh about them, so I usually splurge about $100 on something I've wanted but have avoided buying in the months leading up to it.
Sometimes DH will join me in the planning and shopping if it's something we're both interested in. One year we got me a new socket set - metric and imperial, deepwell and shallow. It was wonderful and I still grin every time I open it up to use them on a project. DH's coworkers thought he'd be in the doghouse forever for that one, they obviously aren't married to engineers.
We've done a few fancy dinners, but we often feel like our own cooking is just as enjoyable to us, so we'll have a drink, watch something on Netflix, and have some... quality time together.