My wife and I arrive FRA on LH from IAD at 7:50 am and leave on LH to VCE at 12:20 pm. We are flying first class to FRA and business class (European style) on to Venice.

We have never been in FRA. With just 4.5 hours and carry-on luggage to contend with we will likely stay at the airport. We are arriving and departing Terminal 1.

I suspect we will be served breakfast on the flight around 6 am or so. I know we have access to the First Class lounge but have no idea what it offers. I'll do some searched on that. we will want to have lunch before we leave FRA. My wife loves looking in (fingers crossed here) shops, particularly those unique to the area.

We usually drag our carry-ons with us as we explore an airport. Is there a safe (locked) place to leave them in the lounge or elsewhere?

Any advice as to what to do will be appreciated.