Depends on what you mean by roam!
If you have a car, then there are more immediately useful ferries from Portsmouth (on the east side of the Solent) and Lymington (on the west) -- Southampton is at the northern tip, with the island south of the Solent.
If you want, you can rent a car or even a bicycle on the island. Plus there are buses and taxis.
Check out the link in the "source" section! (I'm not affiliated with them in any way).
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