Indeed the best type of worship the deed which is performed for the pleasure of the Lord in every time with what that particular time requires and its intent. So the best type of worship at the time of Jihaad: Jihaad even if it leads to leaving off a specific portion of the voluntary good deeds.
At the time of the presence of a guest, for example: (The best type of worship is) Fulfilling his right and preoccupying oneself with this over the preferable, yet non-obligatory good deeds. Likewise, is the fulfillment (of rights of the) wife and family.
The best (worship) at the time of the early morning is occupying oneself with prayer, the Qur'aan, Du'aa, dhikr, and seeking forgiveness.
The best (worship) at the time of a student seeking guidance and the learning of an ignorant person: Accepting what he learns and occupying oneself with it.
The best (worship) at the times of the Adhaan is leaving off of whatever is specific to this time and preoccupying oneself with answering the call of the Mu'adhin.
The best (worship) at the times of the five prayers: Striving to perfectly fulfill them the most perfect manner, making the initiative to perform them in the beginning of the time, and going out to the congregation - and if it were far, then that is even better.
The best (worship) at the times of necessity of the person in need needing help from someone in position, or physical, or financial help: Occupying oneself with helping him, relieving his grief, and giving precedence to that over your specific activities and your personal time.
The best (worship) at the time of reading the Qur'aan: Combining the heart and determination upon reflection upon it and understanding it until it is as if Allaah is addressing you personally with it. So you focus your heart upon understanding it and reflecting upon it, and you bring your determination upon carrying out its commands even more so than one would do if a book came to him from a king or other authority.
The best (worship) at the time of standing at Mount. Arafah: Striving for humbleness, Du'aa, Dhikr - without fasting.
The best (worship) during the ten days of Dhul-Hijjah: Increasing in worship, especially saying Takbeer ("Allaah Akbar"), Tahleel ("Laa Ilaaha Illa Allaah"), and Tahmeed ("al-Hamdulillaah"). For this is better than even the non-obligated Jihaad.
The best (worship) during the last ten nights of Ramadhaan: Staying in the masjid, seclusion, and I'tikaaf without mixing with the people and being preoccupied with them. This is even better than (mixing with them for) their learning of some knowledge or reading of the Qur'aan as is the opinion of many scholars.
The best (worship) at the time of sickness of your brother Muslim or his death: Visiting him or attending his funeral and burying him and giving that precedence over your personal time or your (time on) Friday.
The best (worship) at the time when calamities strike and when the people harm you: Maintaining the obligated patience while still accompanying them rather than running away from them. For indeed, the believer that mixes with the people and is patient with their harm is better than the one who does not mix with them and they do not harm him.
The best (worship) is to accompany them in good, for it is better than being isolated from them (without cooperating in it). Yet, remaining isolated from them regarding evil is better than accompanying them (while cooperating) in it. However, if he knows that by his mixing with him, he is able to remove it (the evil) or decrease it, then his mixing with them is better than his isolation from them.
So the best (worship) at every time and circumstance: Giving precedence to pleasing Allaah at that particular time and situation and occupying oneself with what that time obligates and requires and what it is intended for.
These are the people of absolute worship. They are the best of those who worship Allaah 'Azza Wa Jall.
Source: Madaarij as-Saalikeen
Translator: Abuz-Zubayr 'Abdur-Rahmaan (Scott) Harrison - Rahimahullaah
Note: As salaamu 'alaykum wa Rahmatullaahi wa Barakaatuh... Our brother was recently taken by the Will of our Lord Ta'aalaa, he was our brother in Deen and Salafiyyah and a dear friend, a father and husband. He has helped our growth in the da'wah for a number of years translating our articles and books. May Allaah forgive him of his sins, make these deeds grand on his scale of good deeds, and make him from the occupants of the highest level of paradise, Aameen yaa Rabbanaa! From what we knew of him, he was truly from the best of people and Allaah knows best... Inna lillaahi wa Inna Ilayhi Raaji'oon.