I cherish memories from when my kids were about 1 and 3. Their little faces and voices, the way they played. Between sleep issues and the work to care for little kids it was exhausting. But oh so rewarding. At your phase it's more about the little things, well, little to adults, but in reality the most important things: reading together, playing, chasing, tickling, cuddling, making up silly games. In other words, just living life together. Enjoy the moment because before you know it, it will be gone. And consider how blessed you are to be FIRE and have this time together. Take photos, but also get your phone out and take some videos. You'll thank me later when they get older (happens so fast!) and you can watch those videos and hear their voices. Short and simple camping trips are great at this age, so are short nature walks, and playing in pools, and so on.
When my kids were a little older (5-7ish) we did a couple of longer road trips that were hard, but worth it. FIRE means you can go for longer, like 1-2 months. We would mostly camp, which is cheap, and cook food at the campsite like we normally do at home. We strategically mixed in cheap hotel/motel stays, or stays with family, to break up the camping, take showers, do laundry, etc. With a little bit of planning you can cover a large area divided up into shorter drives, with plenty of time to explore each place. We can do a month long trip for about $1000, mostly gas and campground fees. We took lots of pictures/videos that we still look at 3 years later.