Ensenada is an alright place. There's not a lot of stuff to do there, but it can be somewhat relaxing, and it attracts a lot of college students from California who otherwise wouldn't be able to drink. It is about a two hour drive south from Tijuana, but seems much safer, and more hassle-free.
There are a couple of museums in town. There's a small one that is built into an old jail, and there's this one that is part of some sort of historical site that doubles as a reception hall for weddings.