Worli seaface is my favorite place. During my two years stay in Mumbai I used to go 3/4 times in a week. It is easy to reach this place. You can hire a taxi or go by best bus after getting down at DADAR by railway.
Sea face is very beautiful. You can feel the cool breeze of the vast sea whole day. Specially people come for morning and evening walk. The compound wall is well built where you can sit and relax.
Worli bandra sea link - - you can see beautiful sea link from this sea face.
Hotels are available but a bit heavy on pockets as Mumbai is a major metropolitan city.
Completely safe place. During monsoon in high tides very huge tides hit sea shore at that time you should maintain safe distance.
Thanks!