The guide who led this guided tour was very knowledgeable about local history.  ("Who" refers to people.)
The culinary tour which included tastings of local specialties was the highlight of our trip. ("Which" refers to things.)
Amy wants to get on that scenic train that crosses through the landscape of Switzerland. ("That" can refer to things and is often used to introduce essential relative clauses.)
The Four Seasons Resort, which offers stunning ocean views, is highly rated by guests. ("Which" refers to things, and the clause is non-essential, set off by commas.)
The cruise ship, whose amenities include a rooftop pool and fine dining, is a favorite among holidaymakers. ("Whose" shows possession.)
The hotel staff, from whom we asked for help, were exceptionally friendly and helpful. ("Whom" is the objective pronoun, used after a preposition.)
The restaurant where we dined at yesterday had a menu full of delicious local dishes. ("Where" refers to places.)
Visitors who come to Kyoto are usually impressed by its temples and gardens. ("Who" refers to people.)
The British Museum has many ancient relics which span several millennia of human history. ("Which" refers to things.)
Passengers whose flights were delayed were offered free accommodation for the night. ("Whose" shows possession.)