Good suggestions.  I will just add to keep an eye on weight as well.  I have a pair of 8x21 Tasco binoculars that are probably 20 years old, not the bottom model but by no means high end, coated optics, rubber coated plastic construction.  These weight 6.5 oz with the case.  I have a similar pair that I use while hunting that is rubber coated metal construction and noticeably heavier.  When canoeing I appreciated the lower weight over ruggedness. 

I bring them mainly to check campsites to see if they are available or not.  They also come in handy when other fishermen show up and are fishing the reef within view of your camp as happened to us last week.  My son was able to spy the lures/colors being used and their results. However, he was not able to confirm if their barbs were pinched.   ;D