Our best evaluation of heaven clearly comes from Christ's words on the subject.
1. It's not for everyone [a narrow path].
2. Is beyond man's ability to imagine.
3. Has no marriage [but for project implementation, a maximally
& uniquely compatible soul pairing of male-female may afford
perfect efficiency due to each sex's special aptitude in various areas of insight & appreciation?].
4. Acheived via acts/commitments involving love of God & love of neighbor [Matthew 25: 31-46].
More speculatively, a possible 'heaven' level short of actual heaven?
-- A: heaven with full contact with God and communication [and possibly
even interaction] with all beings in all dimensions/heavens; B: for many who fall short
of heavenly criteria, 'earth bound heaven' eternally within physical
[accessible, multifrequency overlapping Earths-- for unlimited area] limits of this
stabilized planet, galaxy, universe???
'Hell', eternal exclusion from God's presence, is a different subject.