If you only have a short time to spend in Homer, the Alaska Islands & Oceans Visitor Center is a great place to start. The indoor visitor center contains beautiful exhibits that teach of the people and wildlife of the area. It is a bit dark and may be a little scary for the youngest kids, but is great for older kids and adults. There is a fabulous gift shop inside the center that sells every book imaginable about Alaskan plants, animals, and history. We have quite a long wish list for such a tiny shop!
Outside is our favorite part of visiting the Islands & Ocean center. A trail leads from the parking lot downhill to Beluga Slough, which is a beautiful wetlands full of plants and birds (even families of sandhill cranes!). The trail is handicap-accessible and works well with a single-wide stroller. This is a very popular place for bird-watchers. At one point the trail forks. You can continue on to Bishop's Beach, which is a nice place for tide pooling, or take the trail to the right and end up at Two Sisters Bakery for a tasty treat.
The Islands & Ocean Visitor Center offers several guided walks, seminars, and film screenings. If you are new to tide pooling in Alaska, one of their beach walks is the perfect place to start.