When my kiddos were little (preschool), Earthways: Simple Environmental Activities for Young Children was my favorite resource book.
Here’s part of a review on Amazon:
“Earthways is a treasure trove of developmentally-appropriate, imaginative activities in science, nature and art designed to empower young children to feel a joyous kinship with nature. Organized by seasons, this resource book devotes large sections to various nature crafts and natural toys with which young children can celebrate the gifts of the seasons and experience the rhythms and changes of their world. A sampling of seasonal crafts include wheat weaving and leaf crowns in the fall, star windows and snow scenes in the winter, dish gardens and press flower cards in the spring, and paper birds and walnut boats in the summer. Each craft is well-organized, clearly written, and beautifully enhanced by soft, pastel, pencil drawings. Although many of the hands-on activities and crafts are self-directed, some activities do need adult supervision (building an outdoor bean tepee playhouse using five-foot sticks or bamboo poles, or baking a berry shortcake or cobble)…”
Although this book is currently out-of-print, there are quite a few used copies available inexpensively online from Amazon right now.