There is NO high-speed internet at Disney's Hilton Head Resort. Disney uses Verizon as their dial tone provider, and limits the low cost local calls to a small number of exchange prefixs on Hilton Head only.
Warning, don't believe what the phone book in the room says about a larger local calling area. The put a Hargray phone book in the room, but don't use Hargray as the service provider. Always do a short call to the internet connection number, and then check with the Front Desk to see if it actually charged at the local call rate. I found out on Saturday that a "local" call was charged $7.54 on a per minute rate because it was not one of the few exchanges Disney calls "local".
Hargray is the main telephone provider on the island. They will sell you a week of dial-up access with a Hilton Head local number for $15. You get access to a modem pool that answers about 80% of the time, and really connects about 95% of the time that it answers (based on a sample of 25 calls this week).
Connect speeds are not great. The best I could get, at about 3 AM, was 36000.
Beware - I would strongly suggest you run a firewall if you connect through Hargray. I got probed several times on each call, sometimes from other units in Hargray's modem pool, and sometimes from the public Internet.
Hargray's office is about a mile down the road from Disney. The office is open weekdays and on Saturday until 4:00 PM. Saturday was extremely slow service - only two customer reps and about 15 people in line. It took over an hour for me to sign up.
If you "have to check your email for work", why not just go with AOL, use their added cost 800 number dial-up, and have work reimburse you?
PS - I asked when HH would be getting HS Internet and was told that was not planned, as Hargray had the monopoly on the island, did not intend to do broadband, and was pushing DSL.