I agree with @tileg21 - keep expectations low, do a scavenger hunt, bring a book with you where they can try to spot the bird/leaf/tree in the book, bring a magnefying glass so you can look at things up close, play a game of tag or marco polo, bring some art supplies and do a drawing of something cool they see? 3 and 4 are pretty young so they're going to tire out/lose interest quickly, so keep the hike short and sweet and go into it with low expectations. Just going out and spending time with them will probably mean the world to them (and give their parents a much needed break)! 🙂
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