Another warning: starting this quest before speaking to Yaren Bolt and getting the quest Flowers and Gold from him will prevent Gramps to give the recipe for Perfume.
If you choose the other option, the question about Berengar will be asked automatically afterwards, so this is the wiser choice. While it seems more important to ask about Berengar, when choosing this option you will lose access to the other one. Be careful, when you finish the journey you are given two dialogue options.Although interesting, this does not seem to result in any Journal or Quest entry. You may additionally take Gramps all the way to the Druids' grove to initiate a conversation about "Places of Power".Taking the long way around is most profitable. He will give Geralt the chronologically first journal entry for the Mage's tower, the recipes for Maribor Forest and King and Queen and numerous other pieces of advice. Taking Gramps for a grand tour of the swamp before going to the shrine will net all sorts of interesting things.Depending on when you do this quest, there is a high probability that you will encounter the Coccacidium on the way to the shrine, so be prepared.You can even go back and take the quest after telling him to piss off. This does not have any negative effects on this or other quests. You have the option of telling Gramps to "piss off", rather than taking this quest.He awaits the muscle of some kind stranger, so to speak, to offer him their assistance. Gramps, a man that seems as old and lonely as the swamp itself, waits helplessly along the rocky road near the docks.