Just a comment on the myst age portal. Just using a bookstand inside spawn with the book on it does nearly the same thing as to portal, and is only 1 block big rather than a big portal.
Sentry Turrets are your friend...well not really but they destroy creepers...just don't step in front of them either.
Playing: Minecraft, Landmark, EvE
Retired from many, incl: WoW: Aesha, Kael'thas; FFXI: Ehlynia, Pandy; Tera: Ehlynia, PvE.