Cecily

If you go to the egg you mentioned, then look to the right at about a 2 o'clock position (you may have to scroll to the right) you will find another cave with spider eggs. Once initially cleared you will find eggs remaining at the entrance. Clicking the entrance will produce a spider. Kill the spider and you have legs. For future reference I have found that if you have something that is required, clicking on the item may lead you to where/how to get it.

correction, I haven't gotten to the big egg behind that spider statue...and does anybody know where the cave of fear is?

I found two compasses on the first archipelego

Buy the compass. the coins you get on the archipelagos are different. go to the store, open the last icon with the coin. There you will find a compass to buy.