Nantucket is a wonderful place to fish, I am sure you will enjoy it. There are a number of hotspots namely Great Point and Smiths Point. OSV permits are available to get to GP thru the trusteess of the reservations TTOR (You can look them up online). The beach may or maynot be open depending on the bird situation. Seals can be a problem too but normally by July they thin down a bit. Every year is different it seems.
The nantucket sound side of the island is a wonderful light tackle fishery. It is pretty shallow and a ideal spot for fly rod and light gear. The south side is similar to fire island in NY...miles of sandy beach...only nicer. If I were you I would look into fishing Great Point, Miacomet and Smith with the big stick and if you can get a vehicle over to coatue bring your light gear and a lunch for an extended day of fun...for sight casting to bass....this is truely a special place IMO. tread lightly there are few remaining places like this on our coast. Also, you might consider a charter boat trip or two while you are there. The boat fishing can be spectacular. The local shops have the buzz.
Here is a link on the TTOR:
http://www.thetrustees.org/pages/293...ife_refuge.cfm
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