I have to say, after dealing with metatarsalgia for the better part of a year and being in pain walking in sandals, I bought a pair of Crocs sandals on my mom's recommendation (she's 77 with bad feet) and it was an epiphany! Most comfortable sandals I've ever had in my 47 years, and cheap, and rubber, so they dry VERY quickly when they get wet. I ended up buying some of their shoes too which have the same sole materials- the Hover Slip Ons. No more metatarsalgia for me...not sure if I can credit the Crocs sandals (Athens style), but I just bought another pair as a backup (less than $20 on their website).
Regarding the regular old-school style Crocs, the first 50K trail race I ever did, there was one old gal that did it (and apparently many, many other races) in crocs with socks on. They have great shock absorption and are super-light, cheap, and waterproof. Sounds like a winning combo to me!
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