Hmm. Not much (unvisited) terrain left with those constraints.. A visit to Beagle 2 crater in Isidis? A slow climb up Elysium Mons maybe?

aerocapture orbits take quite an extended time to slow the velocity and round out the orbit (adding operations cost to the budget), when that energy can be dispersed much quicker via the well-proven heatsheild method. I'd assume the orbital speed will still be high enough that you'd have use a heatshield for the orbital-to-atmopspheric entry anyways but i am only guessing... I was curious to find the relative velocities of direct atmospheric entry modes vs the slowest possible option for orbital insertion trajectories but ran out of time, here are some starter resources though.