Tokaikisen  operates a daily overnight ferry from Tokyo's Takeshiba pier, near the Daimon metro station. Leaving Tokyo at 22.30, and arriving 9.30 - prices vary seasonally but expect to pay around ¥9000 for a reclining seat.
ANA (All Nippon Airways) flies between Haneda airport in Tokyo and Hachijōjima up to four times a day. Prices vary seasonally, but expect to pay around ¥25-30,000 return. You can get around this by booking on the english version of the Japanese site. From this you will have access to the lowest fares.
Most hotels have bikes for hire, and there are several rent a car agencies on the island.
Hunt for for glow in the dark mushrooms, diving, snorkeling, and trekking to secret waterfalls in the mountains.
Sea Dive, 1309-13 Mitsune (next to the Anchor pub), ☎ 04996-2-5840, . Is a good outfit, with a friendly staff, recommended by the guys at the Anchor pub. Little English is spoken, but they seem pretty acquainted dealing with foreign tourists.
The Anchor Pub, 1309-13 Mitsune (opposite the ferry pier), ☎ 04996-2-1168, . Cozy and laid back atmosphere, run by a friendly Australian-Japanese couple, who are both helpful, and very knowledgeable and about the island. Also serves up some classic pub foods, if fish and rice has started getting on your nerves.
Sokodo-So (そこど荘), 100-1522 Mitsune (Just behind the anchor pub), ☎ 04996-2-0092 (email@example.com, fax: 04996-2-0925), . checkin: 11.00; checkout: 10.00. Very nice place, with a pleasant atmosphere, and traditional style tatami rooms. The Friendly owners also rent out bikes as well as diving and snorkeling equipment. Singles from 4.000 JPY.