12 days in Panama - help with itinery

We are 2 active couples in our 50's & early 60's going to Panama for 2 weeks, including travel days, which leaves us with 12 days of available touring. So far, we have booked a condo that we will share the entire time and will use it as our base camp. We are planning on staying in PC the first 4 days, then onto 2 other locations for a total of 6 more days, then back to PC for the last 2 days.

Our friends are mildly interested in investing in some real estate, but that is not the main thrust of the trip. Boquetes is their main area of interest. As a result we would likely head in the direction of the Chiriqui provence and would like some suggestions as follows:

1- We are considering hiring a driver from PC to David. I understand it takes 6-8 hours by car as opposed to a 55 minute flight (+ the extra time of checking in, picking up baggage, etc.). Flying seems like a preferable choice since driving would eat up most of 2 of the 12 days we have on the entire trip. We would like your advice about this.

2- Is 6 days appropriate in Chiriqui?

3- Which areas/towns in Chiriqui do you recommend?

4- Which hotels or other lodging do you recommend in the $75-150 per night category?

5- Any recommended tours/companies you have experience with?

We are a fairly adventurous and diverse foursome. We enjoy walking, hiking, bird watching, 2 of us are advanced scuba divers although don't plan on diving this trip, river rafting, beaches/water activities, shopping and eating out. We don't have a specific budget per se, but hope to find hotels $75-150 night. Clean, a/c, good beds, safe area are all 'musts'.

Thanks for any help or guidance you can provide.