That is about as easy a question as "How long is a piece of string and who makes the best string?"
There is no universally right answer to either that question or to your questions above without a lot more information such as,
How many people will be cruising aboard and how many will be capable crew?
Where will you be sailing when you are not ''far away from the coast''?
What is your budget?
How experienced are you?
Do you care about how fast the boat sails?
Are you more afraid of capsizing or sinking?
How physically fit are you?
How handy are you at repairing things?
Do you prefer things comfortable more than you prefer things that are easy to maintain?
In the simpliest answer to "What would you say is a good size sailboat for doing this?" roughly 2 1/2 to 5 long tons per person, with as many as 7 tons per person if you have a big enough budget and enough time to buy more sophisticated hardware and maintain it.