valley-of-the-temples (TripAdvisor review) and parcodeitempli could be interesting day-trip from Palermo, though is it about a 2hr ride each way. Some of the private tours spend only 2 hours in the Temple area so if we spend 4-5 hr with a lunch that should be fine.
around-sicily does a private tour of up to 8 people to Agrigento from Palermo. €450 (including driver tip) per van for up to 8 people. Plus admission fees.
sicilianholidays also does a private tour to Agrigento for a similar price.
The bus from Palermo takes 2 hrs to get to Agrigento, which is just a few minutes faster than the train.
cuffaro bus line – bus service from Palermo to Agrigento
In Agrigento take the 1, 1/, 2, 2/, 3, 3/ bus from Piazzale Rosselliand and request stops at San Nicola (Archaeological Museum) or Posto di Ristoro (ticket office in front of the Temple of Ercole), cross the road, and buy a ticket at the checkpoint. It looks like a bus runs every 15 minutes.
|8:00am||Leave hotel & walk to Via Della Liberta.|
|8:10am||Catch Lines 101, 102 and 107 (on side closest to hotel) to the main train station; buy a picnic lunch?|
|8:49am||Regionale 3924 from Palermo Centrale to Agrigento €8.30|
|10:52am||Arrive in Agrigento Train Station|
|11:05am||Catch Bus 1, 2, 2/, 3/ to San Nicola (Archaeological Museum) or Posto di Ristoro (ticket office in front of the Temple of Ercole) (buy day pass €3.30 on bus) agrigento bus info|
|11:15am||Arrive at Museum (Combo ticket €13.50) (cash only)|
|Can take bus from Museum to Temple or walk|
|16:12 (4:12pm)||Catch Buses 1, 1/, 2, 2/, 3/ to Train Station (direction Piazzale Rosselliand)|
|15:14 (3:14pm)||Regionale 3900 from Agrigento to Palermo Centrale (probably too early)|
|17:10 (5:10pm)||Regionale 3908 from Agrigento to Palermo Centrale arrive 7:20pm €8.30|
|18:14 (6:14pm)||Regionale 3910 from Agrigento to Palermo Centrale arrive 8:16pm (backup option)|