Whats the camping like?  

Nice. NP service, so there are tent pads, tables, bearboxes (most sites) and toilets (most sites)

 I recall them having mostly thick vegetation and rocky/pebbly beaches.  Correct?  

Mostly sand beaches to land/launch at the campsites.   Some sites you can use the pier, it appears, I did'nt. Most islands are quite large, with extensive hiking trails. Cool light houses, some still have private property. Bears...

And aren't there just a handful?....how many islands are there?

20 .. I think some are off limits due to wildlife

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