I stay at home with my 15 month old. I have only done this starting about 2 months ago when I was laid off from my full time job. So, I struggled much the same as you did, it's an adjustment!
We go for lots of walks, do you have a stroller? You can even make stops and at her age, she will love just to look around, sit in the grass in a new area, etc.
Do you have any pets? My son LOVES to play with our dog and honestly he keeps us entertained a lot. We'll play "tug," chase, etc.
I spent a lot of time online looking for fun and inexpensive things to do at home with a little one. There's great ideas out there if you can spend a nap time doing some research. Little activities such as "finger painting" with pudding or "painting" the sidewalk with water and a paintbrush. I try to do one new activity with him a day - even if its just a new song or something.
Many moms may disagree, but we watch a decent amount of time watching some of the great educational TV shows on our TV. He loves Sesame Street and we dance to the wiggles. He loves this!
If your wanting to get out of the house, but you have no transportation, you're going to have to get creative! Do you know any other moms or have family nearby that could go with you once a week out into the community to do something with your baby? When we go out of house outings, we go to the library for story hour, park to play, running errands (which is not easy but helps our evenings and weekends be more for family time!), splash pad at the local pool, playdates with some other moms I know, etc. If you have no one to help get you to these places, what about public transporation - a bus?
I reccommend finding a play group or another stay at home mom to interact with. This is really for your sanity mostly :) Also, I have to remember that what I find boring and monotonous, is actually a good thing for my little guy. Small children THRIVE on routine and it makes them feel safe, secure and happy. Try to get your self on some sort of routine. Ours has become every morning we walk up the street to the park after breakfast and he plays for a a bit. Not everything in our day is on a schedule of course, but some things are nice. He always watches Sesame Street while eating lunch for example.
Also, you asked about energy and excitement - that's another story! It's hard. I'm a very organized person and having just left the work force where every moment of my day is pretty scheduled. I found this to be helpful now staying at home - for example, Friday's, I clean (when my son is sleeping or self-occupying of course!). Wednesdays, I NAP during H's nap time. Tuesdays I run errands, Monday's groceries, Thursdays are a fun adventure with my son - library, zoo, etc.
I've always loved to cook, but never had time when I worked. Now, I try a few new recipes each week and I love having a good, home cooked meal every night!
Good luck, it's a crazy fun thing! Especially when you are not used to staying at home and making the adjustment. I've learned more about my son in the last 2 months than ever before. There is NOTHING WRONG with working full time and having your child in daycare, but there sure is something special about spending full time days with him! Make sure to take care of yourself and when your hubby is home, make sure you insist on some me time!